CBSE > Class 07 > Mathematics | CBSE Board | Homework Help

$\begin{aligned} & \mathrm{A}_1=100 \mathrm{~A}_2 \\ & \Rightarrow \frac{\mathrm{A}_1}{\mathrm{~A}_2}=100 \\ & \Rightarrow \frac{\pi \mathrm{r}_1^2}{\pi \mathrm{r}_2^2}=100 \end{aligned}$

$\begin{aligned} & \Rightarrow \frac{\mathrm{r}_1}{\mathrm{r}_2}=10 \\ & \text { So, } \frac{\mathrm{c}_1}{\mathrm{c}_2}=\frac{2 \pi \mathrm{r}_1}{2 \pi \mathrm{r}_2} \\ & =\frac{\mathrm{r}_1}{\mathrm{r}_2}=\frac{10}{1} \end{aligned}$

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Aadarsh Kumar Singh 2 years ago

Pratush kya tum dayanand me study karte the

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(m+6)(m+6)

Posted by Srini Vasan 2 years ago

CBSE > Class 07 > Mathematics

1 answers

Shreyansh Keshri 2 years ago

m²+12m+36

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Three-fourths of the teachers in a school are men while the remaining one-fourth are women. Find the ratio of The male teacher to the female teachers in the school.

Posted by Ayush Gautam 2 years ago

CBSE > Class 07 > Mathematics

1 answers

Preeti Dabral 2 years ago

Let the total no. of teachers in the school be 'x'

Then, total no. of male teachers= 3x/4

Total no. of female teachers= x/4

=> Required ratio= (3x/4)*(4/x)= 3/1= 3:1.

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2x and x = 90°

Posted by Palak Nimade 2 years ago

CBSE > Class 07 > Mathematics

2 answers

Shubh Kumar Singh 2 years ago

2x+x=3x 3x=90° X=90/3 =30°

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Shreyansh Keshri 2 years ago

180°

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The present ages of two students are in the ratio 5:3. After 6 years there ages will be in the ratio 7:5. The present age of the first student is

Posted by Tharani Tharani 2 years ago

CBSE > Class 07 > Mathematics

2 answers

Preeti Dabral 2 years ago

Given the ratio of the ages of two students = 5 : 3
Let their ages be 5<m:omath><m:r>x</m:r></m:omath> and 3<m:omath><m:r>x</m:r></m:omath>
After 6 years, their ages will be 5<m:omath><m:r>x</m:r></m:omath> + 6 and 3<m:omath><m:r>x</m:r></m:omath> + 6
Ratio of their ages after 6 years = 7 : 5
According to the question:
5<m:omath><m:r>x</m:r></m:omath> + 6 : 3<m:omath><m:r>x</m:r></m:omath> + 6 = 7 : 5
Product of mean = Product of extreme
⇒ 5(5<m:omath><m:r>x</m:r></m:omath> + 6) = 7 (3<m:omath><m:r>x</m:r></m:omath> + 6)
⇒ 25<m:omath><m:r>x</m:r></m:omath> + 30 = 21<m:omath><m:r>x</m:r></m:omath> + 42
⇒ 25<m:omath><m:r>x</m:r></m:omath> - 21<m:omath><m:r>x</m:r></m:omath> = 42 – 30
⇒ 4<m:omath><m:r>x</m:r></m:omath> = 8<m:omath><m:r>
⇒ x</m:r></m:omath> = 2
Hence the present ages of two students are 5(2) = 10 years and 3(2) = 6 years.

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Rohit Yadav 2 years ago

Present age 5:3 5×6=30 3×6=18 Ratio=30/18 15/9 5/3=5:3 Present age is=5-30yrs 3-18yrs

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10,00 00000

Posted by D Pavan Kumar 2 years ago

CBSE > Class 07 > Mathematics

0 answers

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Prashavali2.5

Posted by Teena Pradhan 2 years ago

CBSE > Class 07 > Mathematics

0 answers

ANSWER

Thirteen is added to the double of a number. Find the number if the sum is 37

Posted by Priya Murugan 2 years ago

CBSE > Class 07 > Mathematics

4 answers

Preeti Dabral 2 years ago

answer is 12
double of 12 is 24 and 13+24=37

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Aadarsh Kumar Singh 2 years ago

Let the number be x Then, 13+x=37 x=37-13 x=24

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Akshara Kulkarni 2 years ago

Let the number be x 13+(x+x)=37 x+x=37-13 x+x=24 24÷2=12 Therefore x=12

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Rohit Yadav 2 years ago

Let the number be = x x+13=37 x=37-13 x=24 The number is 24 13+24=37

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37-[5+{28-(19-7)}]? Solve it

Posted by Ayush Gautam 2 years ago

CBSE > Class 07 > Mathematics

3 answers

Preeti Dabral 2 years ago

Step-by-step explanation:

37-[5+{28-(19-7)}]

=37-[5+{28-(12)}]

=37-[5+{28-12}]

=37-[5+{16}]

=37-[5+16]

=37-[21]

=37-21

=16

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Shreyansh Keshri 2 years ago

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Akshara Kulkarni 2 years ago

=37-[5+(28-{19-7})] =37-[5+(28-12)] =37-[5+16] =37-21 =16

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Construct ∆ P,Q,R ,given that m angle P-30°Q- 45°and PQ - 6.2 cm

Posted by Poonam Jaiswal 2 years ago

CBSE > Class 07 > Mathematics

1 answers

Shubh Kumar Singh 2 years ago

Didi ye bana ke nahi bheja Jaa sakta byjus pe pucho.

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Can you help me to solve ch 11 ex 11.3

Posted by Jinisha Meghwal 2 years ago

CBSE > Class 07 > Mathematics

4 answers

Akshara Kulkarni 2 years ago

Exercise 11.3 solutions Explaining step by step- Q1] Find the circumference of circle (22/7) a) 14cm -> Circumference of circle =2×22/7×14 =44×2 =88cm b)28mm =circumference of circle =2×22/7×28 =44×4 =176 c)21cm =circumference of circle =2×22/7×21 =44×3 =132cm

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Akshara Kulkarni 2 years ago

Exercise 11.3 solutions:- Explaining step by step

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Rohit Yadav 2 years ago

Which questions

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Pawan Meena 2 years ago

Faces of cube

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4/3-9/6