Examples of Math Problems: Suppose your average, after taking 4 quizzes, is 72 (out of 100). What must your average be on the next 5 quizzes to increase your average to 77 out of 100?

Thursday, July 4, 2013

Suppose your average, after taking 4 quizzes, is 72 (out of 100). What must your average be on the next 5 quizzes to increase your average to 77 out of 100?

This is a weighted average:

%0D%0A%284%2F9%29%2A72%2B%285%2F9%29%2Ax=77%0D%0A

%0D%0A%284%2F9%29%2A72%2B%285%2F9%29%2Ax=77%0D%0A

so that x=81

:)

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