Question

The ages of Rahul and Haroon are in the ratio 5:7. Four years later the sum of their
ages will be 56 years. What are their present ages?
10. The number of boys and girls in a class are in the ratio

Answer 1

Answer:

Solution,

Given,

tatio number=5:7

now,

let the ratio number be 5x and 7x

Again,

After 4 years their ages will be 5x+4 and 7x+ 4

now,

5x+4+(7x+4) = 56

5x+4+7x+4=56

12x+8=56

12x=56-8

12x=48

x=48÷12

x=4

now,

the present age of Rahul=5x

= 5×4

=20

Again,

the present age of Haroon=7x

=7×4

=28

Therefore:the present age of Rahul is 20 and Haroon is 28.

Answer 2

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The age of Rahul and Haroon are in the ratio 5:7. Four years later the sum of ages will be 56 years. What are their present ages?

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Let the current age of Rahul and Haroon be 5x and 7x respectively

Four years later their ages become 5x + 4 and 7x + 4 respectively.

According to the question,

5x + 4 +7x + 4 = 56

or 12x + 8 = 56

Transposing 8 to the RHS we get,

12x = 48

Dividing both sides by 12 gives,

x = 48/12 = 4

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Thus current age of Rahul = 5*4 = 20

Haroon = 7*4 = 28

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