Question 1020230
Let t = Tom's age now, and g = Gerry's age now.
Then from the first sentence we get

t = 0.75g      (Equation A)

From the second sentence, we get

t + 6 = 0.80(g+6)     (Equation B)

substituting Eqn.A into Eqn.B, we obtain

0.75g + 6 = 0.80(g+6)
==> 0.75g + 6 = 0.80g + 4.8
==> 1.2 = 0.05g
==> g = 1.2/0.05 = 24, Gerry's age now
==> t = 0.75*24 = {{{highlight(18)}}}, Tom's age now.