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Posted by **Katherine** on Wednesday, September 22, 2010 at 5:19pm.

please help me i am very confused.....

i need the formula

- Math -
**Ms. Sue**, Wednesday, September 22, 2010 at 5:23pm4 * 88.5 = 354 Total points so far

600 * 0.9 = 540 Total possible for 6 tests

540 - 354 = 186

186/2 = 91 average on the next two tests

- Math -
**Katherine**, Wednesday, September 22, 2010 at 5:30pmcan i get the formula...please

this is what i got.....

the formula is (88.5 + x + y) divide 3=90

90 * 3 =270

so then (88.5 + 91.5 + 90)=270 /3=90

90*3=270

- Math -
**Ms. Sue**, Wednesday, September 22, 2010 at 5:32pmI don't understand your formula. But you didn't get an answer for your problem.

- Math -
**Katherine**, Wednesday, September 22, 2010 at 5:34pmBut the total average has to be 90 not 91 . So we are right , right ?

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**Ms. Sue**, Wednesday, September 22, 2010 at 5:36pmThe total average must be 90. But Wilbur only has 88.5 average at this point. His average grade on the next two tests must be more than 90 for his overall average to be 90.

- Math -
**Katherine**, Wednesday, September 22, 2010 at 5:50pmno it doesnt . Because if you add 88.5+90+91.5 you get 270 and then you divide 3 you get 90.

- Math -
**Ms. Sue**, Wednesday, September 22, 2010 at 5:56pmI'm sorry you didn't understand my explanation. I averaged grades for 32 years in my teaching career and should know what I'm talking about. You cannot bring up an 88.5 average to 90 with only a couple of 90 test scores.

Please sit down with your teacher to have him/her explain this problem to you.

- Math -
**Katherine**, Wednesday, September 22, 2010 at 5:59pmOk i dont understand your formula either. Im sorry, but thankyou anyways. OKAY !!!!

- Math -
**Mr. R**, Monday, December 19, 2011 at 12:58pmUse The following equation:n 2x+4(88.5)/(6)=90. Solve for x.

x=93

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**clare**, Saturday, November 17, 2012 at 11:53amIDK

- Math -
**Shaniqua**, Tuesday, January 22, 2013 at 6:57pmWhy multiple by 0.9???

- Math -
**Mr. H**, Tuesday, April 16, 2013 at 7:01pmI got 94

Im a bad teacher

- Math -
**Cindy**, Tuesday, July 15, 2014 at 11:06amYou multiply by .9 since that in percentage is 90%. He wants a total average of 90% for his remaining tests. The answer is 91.

- Math -
**Kid**, Tuesday, March 3, 2015 at 4:25pmI got 93

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