Question

lucy scored a 85, 64 and 76 on her math exams. what score must lucy obtain on the next math test to have an average of exactly 80?

Answer 1

95

Explanation:

To find the average you take the sum of the scores and then divide it by the number of exams. Let x equal the score Lucy must obtain on the next math test.

`(85+64+76+x)/(4) =80`

Add the scores and multiply both sides by 4

225 + x = 320

Subtract 225 from both sides

x = 95