Question

at present the age of the father is six times the age of his son twenty years from now fathers age will be twice the sons age what is the fathers present age (in years)?

Answer 1

Let father's age be f, and his son's age be s.

So, f=6s and f+20=2(s+20)

Now solve for f and s.

s=5 and f=30

Answer 2

x = 6y. (1)

x + 20 =2(6y + 20). (2)

put x = 6y in (2) ,find the value of y , put it in (1) and equation solved