Question

5 years ago letter A was three times the letter B age find their present age

Answer 1

5 years ago, I was 3 times as old as B
A-5 = 3(S-5)
A-5=3S-15
A-3S=-10...........1

5 years hence, I will be twice as old as him,
A+5=2(S+5)
A+5=2S+10
A-2S=5.............2

equation 2-1
(A-2S) - (A-3S) = 5 - (-10)
B=15

B=15, F=35 are the present age of A and B

thanks