SOLUTION: mattis average on her first 3 test was 88 . What score does she need on her fourth test to make her average exactly 90 ?

SOLUTION: mattis average on her first 3 test was 88 . What score does she need on her fourth test to make her average exactly 90 ?

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Question 728977: mattis average on her first 3 test was 88 . What score does she need on her fourth test to make her average exactly 90 ?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
(3*88+x)/4=90
x=96
another way
88 misses 90 by 2
3*2=6
90+6=96
another way
4*90=360
3*88=264
360-264=96
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