SOLUTION: on three test I scored 84 65 76 what grade must I obtain on the fourth test to equal 80 for all for test

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Question 640806: on three test I scored 84 65 76 what grade must I obtain on the fourth test to equal 80 for all for test
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
on three test I scored 84 65 76 what grade must I obtain on the fourth test to equal 80 for all for test
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Assuming all four tests are equally weighted...
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Let x = score on fourth test
then
(84 + 65 + 76 + x)/4 = 80
(225 + x)/4 = 80
225 + x = 320
x = 320-225
x = 95