Question

Rohan is now half his father's age 20 years ago his father was 6 times older than him find the present ages

Answer 1

let,

his  father  present age be x and his  present age be y

A.T.T.C. 1st

X=2y                                                         1st eq.

Now, A.T.T.C. 2nd

20 yrs ago

6[x-20] = y   , 6x-120 = y                        2nd eq.

putting value of y from 2nd to 1st

x = 6x- 120  ,    5x - 120 = 0

5x = 120

x = 120/5

x = 24 yrs.

after putting value of x in 1st eq. you get

y = 12 yrs