SAT Math Multiple Choice Practice Question 86: Answer and Explanation

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Question: 86

20. Let >n be defined as the smallest perfect square greater than n. For example, >3 = 4 and >4 = 9. Which of the following is equal to >5 + >9?

A. >10
B. >14
C. >20
D. >25
E. >45

Correct Answer: C

Explanation:

C. Following the definition given in the question, >5 = 9, and >9 = 16, so 9 + 16 = 25. Now don't go for the "obvious" answer, Choice (D), because >25 must be greater than 25. The correct answer is Choice (C) because 25 is the smallest perfect square greater than 20.

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