Problema Solution
Mitch scores on the first four math tests were: 85, 89, 90, and 81. what must he score on the fifth test to have an average of at least 90 points?
Answer provided by our tutors
let 'x' be the score on Mitch's fifth test
the average of 85, 89, 90, 81 and x is at least 90
(85 + 89 + 90 + 81 + x)/5 >= 90
by solving we find
x >= 105
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The score on Mitch's fifth test must be at least 105.