SAT Math Multiple Choice Practice Question 141: Answer and Explanation

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Question: 141

9.

If a dart is thrown at the dartboard above, the probability that the dart lands in the square but not in the circle is closest to

A. 10%
B. 20%
C. 25%
D. 50%
E. 80%

Correct Answer: B

Explanation:

B. The area of the square is just 10 × 10 = 100. The area of the circle is πr2, which is π(5)2 = 25π, or about 78.5. So the probability that the dart lands in the square but not in the circle is , which is closest to 20%.

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