Sandras scores on the first 4 test were 87 92 76 and 89


Sandra's scores on the first 4 test were 87%, 92%, 76%, and 89%. What is the minimum score she needs to make an the fifth test so that her average is at least an 80%?

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Mathematics: Sandras scores on the first 4 test were 87 92 76 and 89
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