Question 86026
Let's presume that Sarah takes tests that have a maximum score of 100 points. So her 92.5
average means that on the three tests she took she scored an average of 92.5 points
each time.
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Since Sarah has averaged 92.5 on three tests, on these three tests she has gotten a total
of 92.5 times 3 or 277.5 points.
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If she is to average 94 points on 4 tests she will need 94 times 4 = 376 points. 
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Therefore, on the next test she will have to score enough points to take her total score from
277.5 points to 376 points.
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Find the answer by subtracting 277.5 from 376 and you find that she will need 98.5 points 
out of 100 (or 98.5 percent) on her next exam.
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Hope this helps you to understand the problem.