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Following are the car parking charges near a railway station upto 4hrs Rs 60 8 hrs Rs 100 12hrs Rs 140 24hrs Rs180 Check if the parking chargess are direct proportion to the parking time

Posted by Martin John 7 years, 1 month ago

CBSE > Class 08 > Mathematics

1 answers

Gaurav Seth 7 years, 1 month ago

Direct variation:

If two quantities increase or decrease together in such a
manner that the ratio of their corresponding values remain constant, we say that the two quantities vary directly.

In other words x and y are said to vary directly if X/y = k
, where k is a positive constant.

In direct Proportion

x/y= k

x=ky

So we can find value of k from known values, and then use the
formula to calculate the unknown values

Inverse variation:

Two quantities x and y are said to vary inversely or
indirectly if an increase in x causes a
decrease in y and a decrease in X causes an increase in y in such a way that xy
remains constant.

In other words x and y are said to vary indirectly if x y =
k, where K is a positive constant.

In inverse Proportion

xy= k

x=k/y

So we can find value of k from known values, and then use the
formula to calculate the unknown values

When two quantities x and y are in direct
proportion (or vary directly) they are also written as x∝y.

When two quantities x and y are in inverse proportion (or vary inversely) they are also
written as x∝ 1/y

==========================================================

Solution:

Let the charges be x1 , x2, x3, x4

x1= 60/4= 15

X2= 100/8= 12.50

X3=140/12= 11.67

X4= 180/24= 7.50

x1 ≠ x2 ≠ x3 ≠ x4

Here, The charges per hour are not same ,
Hence the parking charges are not in direct proportion to the parking time.

3Thank You

ANSWER

Length and breadth of a paper is 33cm and 16cm respectively. It is folded about its breadth to form a cylinder. Find the volume of the cylinder.

Posted by Anagha Khedekar 7 years, 1 month ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

all all formulas of ch 11

Posted by Pravleen Kaur 7 years, 1 month ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

3/7+(-6/11)+(-8/21)

Posted by Annu Kumari 7 years, 1 month ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

A milkman sold two cows for rupees 20000 each .On one he got a profit of 5% and on other he got 10% loss find his overall profit or loss%

Posted by Jatin Ajmera 7 years, 1 month ago

CBSE > Class 08 > Mathematics

2 answers

Ashish Dwivedi 7 years, 1 month ago

First case SP is 20000 gain =5 percent find cp 100+5percent /100 ×20000 on other case sp same loss 10 percent find cp for 100 minus loss percent /100 × 10000 then add both cp and both sp and then find

Ashish Dwivedi 7 years, 1 month ago

It's very long so I gave you hint

ANSWER

Express1.5×10^6/2.5×10^-4

Posted by Roop Singh 7 years, 1 month ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

Which face will be opposite to face t after folding a cube

Posted by Aditi Chopra 7 years, 1 month ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

16y Power 3 mines 4y

Posted by Umme Kulsoom 7 years, 1 month ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

What is the binomial

Posted by Aman Dev 7 years, 1 month ago

CBSE > Class 08 > Mathematics

4 answers

Nagaraju Iragaraju 7 years, 1 month ago

The expression contains two terms is called binomial

Saurabh Kumar 7 years, 1 month ago

for example 3a+4y.

Birender Singh Bhati 7 years, 1 month ago

Expression that contain two term is called a binomial.

Navya Sree 7 years, 1 month ago

two terms called binomial

ANSWER

Commercial method ka chapter

Posted by Vansh Tiwari 7 years, 1 month ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

How to remember maths formula easily?

Posted by Jerin Peter 7 years, 1 month ago

CBSE > Class 08 > Mathematics

3 answers

Navya Sree 7 years, 1 month ago

By doing the problem related to that formulas

Om Kumar 7 years, 1 month ago

Eat almonds and do exercise

Vidya Ny 7 years, 1 month ago

Nothing... you just have to know why the formula is used and concentrate to memorize it.

ANSWER

What is congruent

Posted by Sourav Bansal 7 years, 1 month ago

CBSE > Class 08 > Mathematics

1 answers

Sagar Thakur 7 years, 1 month ago

Congruent means SAME SHAPE and SAME SIZE. Same shape means if one is triangle, other is also triangle & if one is quadrilateral, other is also quadrilateral & if one is circle, other is also circle,etc. What is same size? In case of ∆, its corresponding sides should be of equal length. In case of Circle, its radius should be equal. Hope you understood !

ANSWER

Difference between direct and inverse variation

Posted by Janvi Sonone 7 years, 1 month ago

CBSE > Class 08 > Mathematics

1 answers

Krish Sharma 7 years, 1 month ago

Direct means similar like if something is increasing than other will also increase and indirect means unlike like if something if something is increasing than the other will decrease..........#ALL THE BEST ??

ANSWER

Three cubes each of edge 3 cm long, are placed together . Find the surface area of the cuboid so formed.

Posted by Sanjay Mann 7 years, 1 month ago

CBSE > Class 08 > Mathematics

2 answers

Sagar Thakur 7 years, 1 month ago

Length of Cuboid would be 3+3+3=9cm. bredth=3cm & height=3cm. S.A.=2(lb+bh+lh) = 2(9×3+3×3+3×9) = 2(27+9+27) = 2×63 = 126 cm^2.

Hajira Saleem 7 years, 1 month ago

S.A of cube is 6a i.e, 3x3x3x6=8ICM

ANSWER

The average length of the bases of a trapezium is 105 cm. Find its area if its altitude is 99 cm.

Posted by Rashi Aggarwal 7 years, 1 month ago

CBSE > Class 08 > Mathematics

1 answers

Sagar Thakur 7 years, 1 month ago

1/2 × (b1+b2) = 105 cm h = 99 cm Area of Trapezium = 1/2 × (b1+b2) × h =105 × 99 = 10395 cm^2.

ANSWER

Solve this equation (7x-42)

Posted by Rohit Yadav 7 years, 1 month ago

CBSE > Class 08 > Mathematics

3 answers

Pushp Raj 7 years, 1 month ago

(7x - 42) = 7(x -6 )

Rashi Aggarwal 7 years, 1 month ago

7(x -6)

Rohit Yadav 7 years, 1 month ago

7 (x-6)

ANSWER

What price should A shopkeeper mark on a n article costing him rupees 250 to gain 20% after a l l o w i n g a discount of 40%

Posted by Shikhar Bajpai 7 years, 1 month ago

CBSE > Class 08 > Mathematics

3 answers

Sagar Thakur 7 years, 1 month ago

Profit required =₹250×20% =₹50 Let Shopkeeper marks ₹ X for the article. Then X - 40% of X = 250+50 Or, X - 0.4X = 300 Or, 0.6X = 300 Or, X = 300/0.6 = 3000/6 = 500. Hence Shopkeeper should mark ₹500 as price of the article.

Shikhar Bajpai 7 years, 1 month ago

Full answer do

Govind Jain 7 years, 1 month ago

Rs. 500

ANSWER

1cm3______

Posted by Gurudevi Devi 7 years, 1 month ago

CBSE > Class 08 > Mathematics

1 answers

Deepak Kaushik 7 years, 1 month ago

1000L

ANSWER

Write 2.8×10(-10) in usual form

Posted by Angela Roberts 7 years, 1 month ago

CBSE > Class 08 > Mathematics

2 answers

Shikhar Bajpai 7 years, 1 month ago

-280

Sushma Pandey 7 years, 1 month ago

Ans=10.80

ANSWER

Hariti got 85 percent marks in her first term examination and 76 percent marks in her final examination. In her first term examination, the maximum marks were 1200 and in the final examination, the maximum marks were 1500.What is the percentage of marks obtained by Hariti considering both the examinations simultaneously?

Posted by Vishakha Sharma 7 years, 1 month ago

CBSE > Class 08 > Mathematics

2 answers

Sagar Thakur 7 years, 1 month ago

1st term marks = 1200 × 85% =1020 Final exam marks = 1500 × 76% = 1140 Total marks obtained = 1020+1140 = 2160 Maximum Marks = 1200+1500 = 2700 %Marks = 2160/2700 × 100 = 80%

Govind Jain 7 years, 1 month ago

80%