SOLUTION: Jim has grades of 84, 65, and 76 on three math tests. What grade must he obtain on the next test to have an average of exactly 80 for the four tests?
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Question 973951: Jim has grades of 84, 65, and 76 on three math tests. What grade must he obtain on the next test to have an average of exactly 80 for the four tests?
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
to have an average of exactly 80 for the four tests, you need a total of 80 * 4 = 320
for the first three tests we have
84 + 65 + 76 = 225
The grade he must obtain on the next test = 320 -225 = 95
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