PSAT Math Multiple-Choice Question 13: Answer and Explanation

Question: 13

If a certain number is 3 more than 7 times itself, what is the number?

• A. -3
• B.
• C.
• D.

Correct Answer: C

Explanation:

C

The question asks for a certain number that works for the given information. Translate the English into math in order to write an equation. In math terms, "is" means equals, "more" is addition, and "times" is multiplication. The equation becomes x = 3 + 7x. Solve the equation for x. Subtract 7x from both sides to get -6x = 3. Divide both sides by -6 to get . Reduce to get . The correct answer is (C).