SOLUTION: Martin's average score after 4 tests is 89. What score on the 5th test would bring Martin's average up to exactly 90?

Question 325309: Martin's average score after 4 tests is 89. What score on the 5th test would bring Martin's average up to exactly 90?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Martin's average score after 4 tests is 89.
What score on the 5th test would bring Martin's
average up to exactly 90?
------
After 4 tests Martin has 4*89 = 356 points
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Let the 5th score be "x".
---
Solve (356+x)/5 = 90
356+x = 450
x = 94
==============
Cheers,
Stan H.
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