the father is 3 times as old as his son in 10 years time he will be double of his sons age find their peasant age ?
f = 3s
3s+10 = 2(s+10)
s = 10
f = 30
check: in 10 years, 40 = 2*20
3s+10 = 2(s+10)
s = 10
f = 30
check: in 10 years, 40 = 2*20