Question

If c+d=40 and 10 ≤ c ≤ 30, all of the following are possible values of d EXCEPT,

A. 7
B. 14
C. 21
D. 28

Answer 1

A. 7

Explanation:

If you were to solve for c by using d as 7 you would get:

c+7=40

c would then equal 33, which is greater than 30