SAT Math Multiple Choice Practice Question 547: Answer and Explanation

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Question: 547

4. During the past week, a factory produced 10,000 computer disks, of which 30 were found to be defective. At this rate, if the factory produced 1,000,000 computer disks, approximately how many would be defective?

A. 3
B. 30
C. 300
D. 3,000
E. 30,000

Correct Answer: D

Explanation:

D You can set up a proportion, or simply notice that 1,000,000 is 10,000 × 100. So if you multiply 30 by 100 you get 3,000.

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