Question 597340

J = 4D

J + 6 = 2(D+6)

substituting, J = 4D:

4D + 6 = 2D + 12

2D = 6

D = 3

J = 12

CHECK:

12 = 4(3)

12 + 6 = 2(3 + 6)
18 = 2(9) = 18