Question

From the set {7, 15, 18), which of the values can be substituted for c to make the

equation true.

90 - 2c = 60

A. 7
B. 18
C. none of these
D. 15

Answer 1

D. 15

Explanation:

90 - 30 = 60

2 • 15 = 30

the answer is 15