PSAT Math Multiple-Choice Question 91: Answer and Explanation

Question: 91

What is the value of x in the equation above?

• A. 8
• B. 9
• C. 16
• D.

Correct Answer: C

Explanation:

C

The question asks for the value of x in the equation. Because the question asks for a specific value and the answers contain numbers in increasing order, plug in the answers. Since 16 is divisible by 4 and 8, it is easier to multiply and by 16 than it is to multiply those fractions by 9, so start with (C). If x = 16, the equation becomes 13 - = - 5. This becomes 13 - 3(4) = 3(2) - 5, which simplifies to 13 - 12 = 6 - 5 or 1 = 1. This is true. The correct answer is (C).