Question 773211
Hint: Substitute the first equation into the second equation for A:

(1/4)F + 4 = (1/3)(F + 4)

(1/4)F + 4 = (1/3)(F) + 4/3

(1/4)F - (1/3)F = -4 + 4/3

(-1/12)F = -8/3

F/12 = 8/3

F = (8/3)(12) = 32

A = (1/4)F = 32/4 = 8

Andrew is 8 years of age
Father is 32 years of age

Hope it helps!

John10