ISEE Mathematics Achievement Question 291: Answer and Explanation
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Question: 291
3. Catherine scores 84, 85, and 88 on her first three exams. What must she score on her fourth exam to raise her average to an 89 ?
- A. 99
- B. 97
- C. 93
- D. 91
Correct Answer: A
Explanation:
A First, add the three scores to find Catherine's current point total. 84 + 85 + 88 = 257. Next, make an Average Pie 
with 4 in the # of items place since there will be a fourth test, and 89 as the desired average. Multiply 4 × 89 to find a total of 356. Subtract the totals to find that 356 - 257 = 99. This means that she must score a 99 on the fourth test to raise her average to an 89. The correct answer is (A).