Question

13th question pls answer!!

Answer 1

see the attachment
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Answer 2

let son's age at five years ago = x
and father's age at five years ago = 7x
son's present age = x+5
and the father present age =7x+5
five years hence,
son's age = x +5+5 =x+10 years
father's age = 7x+5+5 = 7x+10
according to question,
(x+10)* 3 = 7x+10
3x +30 = 7x+10
7x-3x = 30-10
4x =20
x=20/4
x= 5
so , son's present age = x+5 = 5+5 =10 years
father's present age = 7x+5 = 7*5+5
35+5= 40 years