A student has gotten the following grades on his tests. What is the minimum grade he must get on the last test in order to have an average of 87?

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A student has gotten the following grades on his tests. What is the minimum grade he must get on the last test in order to have an average of 87?
78, 93, 87, 89

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Answer 1 · 2018-06-13T06:29:53

88

Find the total score for the 4 tests
#78+93+87+89=347#

Find the total score for 5 tests
#87xx5=435#

Find the score needed for the 5th test
#435-347=88#