SOLUTION: Jim has gotten scores off 68 and 70 on his first two test. What score must he get on his third test to keep a average of a 89

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Question 1156216: Jim has gotten scores off 68 and 70 on his first two test. What score must he get on his third test to keep a average of a 89
Answer by stanbon(75887) About Me  (Show Source):
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Jim has gotten scores off 68 and 70 on his first two test. What score must he get on his third test to keep a average of a 89 ?
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Let the 3rd test score be "x".
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Equation::
Solve for "x"::
(68 + 70 + x)/3 = 89
68 + 70 + x = 3*89
x = 267 - 138
x = 129 (score required)
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Note He cannot get an average of 89.
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Cheers,
Stan H.