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

## Answer This Question

## Related Questions

- Tribhuwan - sheila has taken five tests so far this semester. if she gets a 70 ...
- Math - Kami has an average of 64% in her class. School ends soon and she would ...
- Maths - Jim has grades of 84, 65, and 76 on three math tests. What grade must he...
- math - jim has grades of 84, 65, 76 on three tests. what grade must he obtain on...
- 6th grade math - Chris has made the following grades on five math test. 90,74,86...
- math - Jim has grades of 84, 65, and 76 on three math tests. What grade must he ...
- Math - In your class, you have scores of 73,85,76, and 92 on the first ...
- Pre Algebra - In Wilbur's math class, his grade is based on the average score of...
- Math - In Wilbur's math class, his grade is based on the average score of six ...
- Math - Mike scored 85, 88, 87, 93, 95, 92, and 83 on his math tests. What is the...

More Related Questions