Best Answer

This problem can be solved using proportions.

81 90
___ = ____

x 100

Cross-multiplication gives us

(81)(100) = 90x

8100 = 90x
____ ___

90 90

90 = x

The class consists of 90 students.

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โˆ™ 2009-12-04 20:51:38
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Q: There are 81 students that make up 90 percent of the class How many students in all?
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