I got the same question and Im pretty sure its d. 20
X=7/3
solution steps:
subtract 2 from both sides
subtract 2x from both sides
Answer:
8 cubes are painted on 3 sides
24 cubes are painted on 2 sides
22 cubes are painted on 1 sides
6 cubes are painted on 0 side
E = 3 * 8/60 + 2 * 24/60 + 1 * 22/60 + 0 * 6/60 = 47/30 = 1.567
Y= -1 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!