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September 20, 2014

September 20, 2014

Posted by **Tyler** on Wednesday, April 9, 2008 at 10:50pm.

There are 171 seventh graders eating lunch. This number represents 45% of all of the seventh grades. How many 7th graders are there in the school?

Would I take 171 x 45% and add them together or take 171 X .55 or??

- Math -
**Reiny**, Wednesday, April 9, 2008 at 10:58pmDo you know algebra?

let the number of students be x

.45x = 171

x = 171/.45

x = 380

or do it by the "3 step process"

45% represents 171

so 1% = 171/45 = 3.8

100% = 100*3.8 = 380

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