Question

Mr.jibril is four times as old as his son. four years,he was seven times as old as his son. In how many years will Mr.Jibril's age be twice his son's age

Answer 1

After 16 years Mr. Jibril will be twice as old as his son.

Explanation:

t - age Mr. Jibril

s - son age

t=4s (father is 4 times older than son)

t-4=7(s-4) (4 years ago they both have 4 year old less and father was 7 times older than son)

t=7s-28+4

t=7s-24

7s-24=4s

3s=24

s=8

t=32

x- years after Mr. Jibril will be twice as old as his son.

32+x=2(8+x)

32+x=16+2x

16=x

x=16