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Question

Brian got grades of 92,89 and 86 on his first three math tests. What grade must he get on his final test to have an overall average of 90?

A
90
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B
93
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C
87
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D
85
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Solution

The correct option is B 93
Let the grade he got on final test be x
The average of all four grades is 90.
So, we have (92+89+86+x)4=90
x=360267=93

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