Five years hence, fathers age will be three times the age of his son. Five years ago, father was seven times as old as his son. Find their present ages.

Answer

40 years, 10 years

Explanation

Let the present ages of the man and his son by x years and y years respectively. Then,
` x + 5 = 3( y + 5) rArr x - 3y = 10" "`… (i)
`and x - 5 = 7( y - 5) rArr x - 7y = - 30." " `… (ii)