Question

5 years hence the age of father shall be three times the age of his son while 5 years earlier the age of father was 7 times the age of his son. find their resent ages???

Answer 1

let the present ages of father and son be x and y respectively,
=> x+5 = 3(y+5)
=> x+5 = 3y+15
=>x-3y = 10
Also, x-5 = 7(y-5)
=> x-5 = 7y - 35
=>x - 7y = (-30)
(-)x - 3y = 10
————————
-4y = (-40)
y = 40/4 = 10
x = 10+3(10) = 40.