Posted by **sasha** on Thursday, October 18, 2007 at 9:01pm.

a student wants to get an average of 80 on the 5 tests to earn an A grade.on the 4 test he gets 79, 88,64,78. how much should he score on the 5th test so that he gets this average of 80?

- math ( average) -
**Reiny**, Thursday, October 18, 2007 at 9:10pm
(79+88+64+78+newtest)/5 = 80

solve for "newtest"

- math ( average) -
**sasha**, Thursday, October 18, 2007 at 9:18pm
still don't get it

- math ( average) -
**Ms. Sue**, Thursday, October 18, 2007 at 9:53pm
Check my answer below.

- math ( average) -
**Emily**, Thursday, October 18, 2007 at 9:11pm
Let's say the score of the 5th test her is x. To get an average of something, you add everything up and divide by the number of numbers (in this case, tests), right? So, this is how you would set this one up:

79+88+64+78+x

------------- = 80

5

Can you solve the rest?

- math ( average) -
**Ms. Sue**, Thursday, October 18, 2007 at 9:13pm
The student needs a total of 400 points on 5 tests to get an average of 80.

He has a total of 309 on the first four tests. What score does he need on the fifth test to bring his total up to 400?

- math ( average) -
**Anonymous**, Friday, January 20, 2012 at 3:38pm
91

- math ( average) -
**Jeremiah**, Wednesday, July 17, 2013 at 10:02pm
What is the next step after adding and dividing?

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