SOLUTION: Franco's scores on four tests are 93, 85, 100, and 86. What must the score be on the fifth test for his average to be 90?

SOLUTION: Franco's scores on four tests are 93, 85, 100, and 86. What must the score be on the fifth test for his average to be 90?

Algebra.Com

Question 1021809: Franco's scores on four tests are 93, 85, 100, and 86. What must the score be on the fifth test for his average to be 90?
Answer by addingup(3677) (Show Source): You can put this solution on YOUR website!
(93+85+100+86+x)/5 = 90
(364+x)/5 = 90 Multiply both sides times 5
364+x = 450 subtract 364 from both sides
x = 86
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