Renee is twice as old as Dana Four years ago Renee was three times as old as Dana. How old are Renee and Dana now?

Renee is 16 and Dana is 8.

Four years ago, Renee was 12 and Dana was 4

R = 2 (D)

R-4 = 3(D-4)

Substitute 2D for R

2D-4 = 3D-12

8 = D