Answer
Thriller – 27 million
The Wall – 23 million
Work Step by Step
Let t = sales brought in by Thriller in millions
Let w = sales brought in by The Wall in millions
t = w + 4
t + w = 50
(w + 4) + w = 50
2w + 4 = 50
2w = 46
w = 23
t = (23) + 4 = 27