# Math

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Desiree's test score are 77,90,66 and 82.what score does she need on the last test in order to average 80 on her tests ?

• Math -

500 * .8 = 400

77 + 90 + 66 + 82 = 315

400 - 315 = 85 needed on next test

• Math -

mean = ∑x/n

80 = (77+90+66+82+x)/5

Solve for x.

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