ISEE Mathematics Achievement Question 289: Answer and Explanation
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Question: 289
1. The average of 3 numbers is 18. What is two times the sum of the 3 numbers?
- A. 108
- B. 54
- C. 36
- D. 18
Correct Answer: A
Explanation:
A Use an Average Pie to solve this question: 
. Place 3 in the # of items and 18 in for the average. Multiply these numbers to find the total, which is 54. The question asks for twice the sum, which is the same as twice the total, so 2 × 54 = 108. The correct answer is (A).