A father is 4 times as old as his daughter. In 6 years, he will be 3 times as old as she is. How old is the daughter now?
F is father's age
D is daughter's age
F = 4D eq. 1
F + 6 = 3(D + 6) eq. 2
let's substitute eq. 1 into eq. 2
4D + 6 = 3(D + 6)
4D + 6 = 3D + 18
4D - 3D = 18 - 6
D = 12
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