Question 523230: To remain on financial aid, Millie needs to complete an average of at least 7 credits per quarter each year. In the first three quarters of 2009, Millie completed 5, 7, and 8 credits. How many credits of course work must Millie complete in the fourth quarter if she is to remain on financial aid?
Answer by bucky(2189)   (Show Source):
You can put this solution on YOUR website! Since Millie is to average 7 credits each quarter, she is expected to complete 28 credits (an average of 7 credits per quarter times 4 quarters) in the 4 quarters.
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In the first three quarters she completed a total of 20 credits (5 + 7 + 8). So Millie has to complete 8 credits in the fourth quarter to stay on financial aid.
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Hope this helps you to understand how to work this problem. It is a useful analysis that works just as well for test scores. Example, if I want to average at least 88 on 4 tests after scoring 91, 89 and 80 on my first three tests, what do I have to score on my final test to make my desired average score of 88. Answer: 88 * 4 = 352 points I need total. On three tests I have gotten a total of 260 points. So I need 352 minus 260 = 92 on the fourth test. With at least 92 points on the fourth test I will average 88 (or more if I score above 92).
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