Posted by **keke** on Tuesday, May 29, 2012 at 5:38pm.

mike has an average of 89 on the five tests he has taken so far this semester. what grade must mike earn on the next test to raise his average grade exactly to 90?

- math -
**Ms. Sue**, Tuesday, May 29, 2012 at 5:43pm
5 * 89 = 445

600 * 0.9 = 540

540 - 445 = 95

- math -
**Bosnian**, Tuesday, May 29, 2012 at 6:39pm
( x 1 + x 2 + x 3 + x 4 + x 5 ) / 5 = 89 Multiply both sides by 5

x 1 + x 2 + x 3 + x 4 + x 5 = 89 * 5 = 445

( x 1 + x 2 + x 3 + x 4 + x 5 + x 6 ) / 6 = 90

( 445 + x 6 ) / 6 = 90 Multiply both sides by 6

445 + x 6 = 6 * 90 = 540

x 6 = 540 - 445 = 95

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