PSAT Math Multiple-Choice Question 119: Answer and Explanation

Question: 119

What is the value of if 10a = 13?

• A.
• B. 4
• C. 6
• D.

Correct Answer: B

Explanation:

B

The question asks for the value of an expression given an equation. Start by finding the value of a from the equation. Divide both sides by 10 to get a = . Next, substitute for a in the expression to get . Get a common denominator by multiplying by . The expression becomes . Subtract within the parentheses to get . Multiply to get or 4. The correct answer is (B).