CBSE > Class 08 > Mathematics | CBSE Board | Homework Help

Sol= Take, X-5/2 Then multiply the product by 8 (x-5/2)8 Let the result be 3x then, (x-5/2)8 =3x 8x-5/2*8=3x 8x-40/2=3x 8x -3x=40/2 5x=20 X =20/5 X=4 Therefore the number is 4.

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Zainab Fatima 5 years, 5 months ago

Amina thinks of a number and subtracts 5/2 from it. She multiplies the result by 8. The result now obtained is 3 times the same number she thought of. What is the number? Solution: Let the number be x, According to the question, (x – 5/2) × 8 = 3x ⇒ 8x – 40/2 = 3x ⇒ 8x – 3x = 40/2 ⇒ 5x = 20 ⇒ x = 4 Thus, the number is 4.

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Gaurav Seth 5 years, 5 months ago

1. Amina thinks of a number and subtracts 5/2 from it. She multiplies the result by 8. The result now obtained is 3 times the same number she thought of. What is the number?

Solution:

Let the number be x,

According to the question,

(x – 5/2) × 8 = 3x

⇒ 8x – 40/2 = 3x

⇒ 8x – 3x = 40/2

⇒ 5x = 20

⇒ x = 4

Thus, the number is 4.

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ANSWER

An article was purchased for rupees 1239 including gst of 18 %.find the price of the article before gst was added

Posted by Lakshmi Idupulapati 5 years, 5 months ago

CBSE > Class 08 > Mathematics

2 answers

Zainab Fatima 5 years, 5 months ago

Given that the price of an article including GST of 18% is Rs.1239 Let the price of the article before GST be x Therefore, x+18% ofx=1239 ⟹x + 18x/ 100=1239 ⟹(100x+18x)/100 =1239 ⟹118x=1239×100 ⟹x=(1239×100)/118=1050 Therefore the price of the article before GST is Rs.1050

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Yogita Ingle 5 years, 5 months ago

Given that the price of an article including GST of 18% is Rs.1239

Let the price of the article before GST be x

Therefore, x+18% ofx=1239

⟹x + 18x/ 100=1239

⟹(100x+18x)/100 =1239

⟹118x=1239×100

⟹x=(1239×100)/118=1050

Therefore the price of the article before GST is Rs.1050

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ANSWER

Ex 2.2 example 8

Posted by Karanam Dharneesh 5 years, 5 months ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

A scooter was bought at 42 , 000.it's value depreciated at the rate of 8 percentage per annum find its value after one year.

Posted by Greshy Parihar 5 years, 5 months ago

CBSE > Class 08 > Mathematics

2 answers

Aido Tali 5 years, 5 months ago

38,640

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Yogita Ingle 5 years, 5 months ago

A = 42000(1 − 8/100 )¹
= 42000(0.92)
= 38640

Value of the scooter after 1 year is Rs. 38,640.

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ANSWER

_11b+7=40

Posted by Sai Dileep Dakka.Sai Dileep 5 years, 5 months ago

CBSE > Class 08 > Mathematics

5 answers

Naga Anjana 5 years, 5 months ago

11b +7 =40 11b =40 - 7 11b =33 b=33/11 B=3

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Sparsh Raj 5 years, 5 months ago

11b+7=40 11b = 40-7 11b = 33 b = 33÷11 b = 3. Answer is 3

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Greshy Parihar 5 years, 5 months ago

find the amount and the compound interest on Rs . 10000 .

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Everything Here 5 years, 5 months ago

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Yogita Ingle 5 years, 5 months ago

11b + 7 = 40

11b = 40 - 7

11b = 33

b = 33/11 = 3

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ANSWER

Try these, consider a special case of Identity (IV) with b=-a. What do you get? Is it related to identity (III)?

Posted by Vanshika Verma 5 years, 5 months ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

Try these, consider,the special case of Identity (IV) with a=-c and b=-c. What do you get? Is it related to identity (II)?

Posted by Vanshika Verma 5 years, 5 months ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

Try these Consider,the special case of Identity (IV) with a=b, what do you get? Is it related to identity (I)?

Posted by Vanshika Verma 5 years, 5 months ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

Try these 1). Verify identity (IV), for a=2,b=3,x=5.

Posted by Vanshika Verma 5 years, 5 months ago

CBSE > Class 08 > Mathematics

1 answers

Gaurav Seth 5 years, 5 months ago

We have

   ( x + a) ( x + b) = x²+ ( a + b)x + ab

Putting a = 2, b = 3 and x = 5 in the indentity:

                   LHS = ( x + a ) ( x + b )
                         = ( 5 + 2) (5 +3)
                         = 7 x 8
                         = 56

                 RHS = x²+ ( a + b )x + ab
       = (5)²+ (2 + 3) x 5 + (2 x 3)
         = 25 + (5) x 5 + 6
         = 25 + 25 + 6
       = 56

∴ LHS = RHS

∴ The given identity is true for the given values.

1Thank You

ANSWER

Two trains starting at the same time having lengths 200 m each are moving in same direction . If the speed of eacg of each train is 30 km/ he and 35 km / he respectively find when they will cross each other

Posted by Jyotirmayee Sahoo 5 years, 5 months ago

CBSE > Class 08 > Mathematics

1 answers

Yogita Ingle 5 years, 5 months ago

Let the duration be x

Let Train A be the train that traveled at 30km/h

And Train B be the train that traveled 35 km/h

Express the distance traveled by train A in term of x

Distance = Speed x Time

Distance = 30x

Express the distance traveled by train B in term of x

Distance = Speed x Time

Distance = 35x

The length of the each train is 200 m.

Therefore, for the train to completely cross each other, Train B (the faster train) will have to be 200 ahead of train A.

Convert 200 m to km

200m = 0.2 km

solve x:

35x - 30x = 0.2 km

5x = 0.2

x = 0.04 h or 2.4 mins

Answer: The train will crossed each other in 2.4 mins.

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ANSWER

(x) to 2

Posted by Ranjan Kumar 5 years, 5 months ago

CBSE > Class 08 > Mathematics

1 answers

Ranjan Kumar 5 years, 4 months ago

x²

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ANSWER

Math exercise 2.1

Posted by Mohd Jalal 5 years, 5 months ago

CBSE > Class 08 > Mathematics

1 answers

Everything Here 5 years, 5 months ago

Solve the following questions. 1. Ans. = 7 + 2 [Adding 2 to both sides] = 9 2. Ans. = 10 – 3 [Subtracting 3 from both sides] = 7 3. Ans. [Subtracting 2 from both sides] 4. Ans. [Subtracting from both sides] 5. Ans. [Dividing both sides by 6] 6. Ans. = [Multiplying both sides by 5] = 50 7. Ans. [Multiplying both sides by 3] [Dividing both sides by 2] 8. Ans. [Multiplying both sides by 1.5] 9. Ans. [Adding 9 to both sides] [Dividing both sides by 7] 10. Ans. [Adding 8 to both sides] [Dividing both sides by 14] 11. Ans. [Subtracting 17 from both sides] [Dividing both sides by 6] 12. Ans. [Subtracting 1 from both sides] [Multiplying both sides by 3]

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ANSWER

8p divided 2power minus 3=29

Posted by Bhavesh Pandey 5 years, 5 months ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

Ls no 3 Square and square roots

Posted by Anushree Khandelwal 5 years, 5 months ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

√288/√128

Posted by Kartik Singh 5 years, 5 months ago

CBSE > Class 08 > Mathematics

1 answers

Yogita Ingle 5 years, 5 months ago

√288/√128

=4√18/ 4√8

= √18/√

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ANSWER

(3x)+89=100

Posted by Himesh Vishwakarma 5 years, 5 months ago

CBSE > Class 08 > Mathematics

4 answers

Naga Anjana 5 years, 5 months ago

3x =100-89 3x=11 X=11/3

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Sparsh Raj 5 years, 5 months ago

3x + 89 =100 3x =100 - 89 3x = 11 x = 11/3 Answer is 11/3

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Everything Here 5 years, 5 months ago

x = 11/3

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Yogita Ingle 5 years, 5 months ago

3x + 89 = 100

3x = 100 - 89

3x = 11

x = 11/3

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ANSWER

What is the meaning of the free fire ? And who are playing

Posted by Mohith B K 5 years, 5 months ago

CBSE > Class 08 > Mathematics

1 answers

Everything Here 5 years, 5 months ago

I am playing

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ANSWER

4(67898766) -

Posted by Ayushi Tiwari 5 years, 5 months ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

What is the maths basically

Posted by Aparna Aparna 5 years, 5 months ago

CBSE > Class 08 > Mathematics

2 answers

Naga Anjana 5 years, 5 months ago

Maths is an arthemetic calculation which is used in many ways

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Mohamed Raihan 5 years, 5 months ago

Mathematics includes the study of such topics as quantity, structure, space, and change. It has no generally accepted definition.

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ANSWER

What is cube root of 6

Posted by Harman Lal 5 years, 5 months ago

CBSE > Class 08 > Mathematics

3 answers

Piyush Maurya 5 years, 5 months ago

1.817

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Mohamed Raihan 5 years, 5 months ago

No, it is 1.817

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Hamsa Priya 5 years, 5 months ago

1Thank You

ANSWER

Difference between compound interest and simple interest

Posted by Janvi Jitani 5 years, 5 months ago

CBSE > Class 08 > Mathematics

2 answers

Yogita Ingle 5 years, 5 months ago

<th colspan="3">Simple Interest and Compound Interest Differences</th>

Parameter	Simple Interest	Compound Interest
Definition	Simple Interest can be defined as the sum paid back for using the borrowed money, over a fixed period of time.	Compound Interest can be defined as when the sum principal amount exceeds the due date for payment along with the rate of interest, for a period of time.
Formula	S.I. = (P × T × R) ⁄ 100	C.I. = P(1+R⁄100)^t − P
Return Amount	The return is much lesser when compared to Compound Interest.	The return is much higher.
Principal Amount	The principal amount is constant	The principal amount keeps on varying during the entire borrowing period
Growth	The growth remains quite uniform in this method.	The growth increases quite rapidly in this method.
Interest Charged	The interest charged on is for the principal amount.	The interest charged on it is for the principal and accumulated interest.

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Mohit Kumar 5 years, 5 months ago

Simple interest m jo amount lea hota h.. Ussi pe interest aata h.. Compound interest m interest pe interest aata h

1Thank You

ANSWER

(12√49)×(12√49)

Posted by Quadir Alam 5 years, 5 months ago

CBSE > Class 08 > Mathematics

4 answers

Piyush Maurya 5 years, 5 months ago

12×12×49 7056

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Yogita Ingle 5 years, 5 months ago

Correct one

(12√49)×(12√49)

= (12× 12√49 × 49)

= 144 × 49

= 7,056

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Yogita Ingle 5 years, 5 months ago

(12√49)×(12√49)

= (12× 12√49 × 49)

= 144 √ 49

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Kishore V 5 years, 5 months ago

Jjj

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ANSWER

a cylindrical pillar is 1 metre in diameter and 4.2 in height find the cost of whitewashing the curved surface of the pillar at the rate of rupees 15 per square metre

Posted by Isha Garg 5 years, 5 months ago

CBSE > Class 08 > Mathematics

4 answers

Piyush Maurya 5 years, 5 months ago

D of gillar=1(given) R of pillar=1/2 Curved surface of cylinder=2πrh Hight =4.2(given) =2×22/7×1/2×4.2=13.2 13.2×15=₹198

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Kalu Ram Garasiya I Am A 5 years, 5 months ago

78t

1Thank You

Anusha Chowdhury 5 years, 5 months ago

Dimensions of the cylinder Piller is Diameter = d = 1 m Radius ( r )= d / 2 = 1 / 2 m Height = h = 4.2 m Curved surface area of the cylinder C.S.A = 2πrh = 2 × 22 / 7 × 1 / 2 × 4.2 = 13.2 square meters Cost of white washing the CSA of Piller per square meter = Rs 15 Cost of white washing the 13.2m Piller = 13.2 × 15 = Rs 198

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Gaurav Seth 5 years, 5 months ago

Dimensions of the cylinder Piller is

Diameter = d = 1 m

Radius ( r )= d / 2 = 1 / 2 m

Height = h = 4.2 m

Curved surface area of the cylinder

C.S.A = 2πrh

= 2 × 22 / 7 × 1 / 2 × 4.2

= 13.2 square meters

Cost of white washing the CSA of

Piller per square meter = Rs 15

Cost of white washing the 13.2m Piller

= 13.2 × 15

= Rs 198