Question 628152
Current ages:

F = 3 + 3S

In 3 years time:

F + 3 = 10 + 2(S+3)

Solving by substitution:

3 + 3S + 3 = 10 + 2(S+3)

6 + 3S = 10 + 2S + 6

S = 10

F = 33