Question

Emily is three years older than twice her sister Mary’s age. The sum of their ages is less than 30.

Let x represent Mary's age.

Which inequality represents Mary’s possible age?

A. 0 < x < / = 9
B. 0 < x < / = 18
C. 0 < x < 18
D. 0 < x < 9

Answer 1

2x+3+x<30

3x<27

x<9

The answer would be D.