PSAT Math Multiple-Choice Question 360: Answer and Explanation

Question: 360

For every 4,000 snowblowers produced by a snowblower factory, exactly 8 are defective. At this rate, how many snowblowers were produced during a period in which exactly 18 snowblowers were defective?

• A. 6,000
• B. 9,000
• C. 12,000
• D. 18,000

Correct Answer: B

Explanation:

B

Difficulty: Easy

Strategic Advice: When ratios involve large numbers, simplify if possible to make the calculations easier.

Getting to the Answer: Let b equal the number of snowblowers produced. Set up a proportion and solve for b. Be sure to match the units in the numerators and in the denominators on both sides:

This matches (B).