Question

rajiv's age after 15 years will be 7 times his age 3 years back. what is the present age of rajiv?
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Answer 1

Let Rajeev's present age be  x years.

Rajeev's age after 15 years = (x + 15) years.

Rajeev's age 3 years back = (x - 3) years

Then ATQ,  

x + 15 = 7 (x - 3)

x + 15 = 7x - 21

=> x-7x = -21-15

=> -6x = -36

=> x=-36/-6

=>x = 6

Therefore rajiv's age will be 6 yrs.

Answer 2

Answer:

let Rajiv's present age=x

3years ago his age=x-3

after 15 years his age =7(x-3)

x-3=7x-21

-3+21=7x-x

18=6x

18/6=x

3=x

so his present age is three years