SOLUTION: Paul has grades of 64 and 90 on his first two math tests. What score mus he get on his third math test to have an average of at least 70?

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Question 725509: Paul has grades of 64 and 90 on his first two math tests. What score mus he get on his third math test to have an average of at least 70?
Found 2 solutions by stanbon, rajagopalan:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Paul has grades of 64 and 90 on his first two math tests. What score mus he get on his third math test to have an average of at least 70?
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Let the 3rd test score be "x".
Equation:
(64+90+x)/3 >= 70
(154+x) >= 210
x >= 56
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Cheers,
Stan H.

Answer by rajagopalan(174) About Me  (Show Source):
You can put this solution on YOUR website!
His total shall be 70x3=210 for 3 tests in math
His total for 2 tests=64+90=154
His score for 3rd test shall be =210-154=56
verification
total in 3 tests =64+90+56=210
Answer 56 marks