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October 1, 2014

October 1, 2014

Posted by **jerson** on Monday, September 8, 2008 at 9:13pm.

my teacher said it's 21 * 87 + 32 * 81/53= 83.4

but i'm not sure where the 53 came from..

thanks in advance

- trig -
**Elena**, Monday, September 8, 2008 at 9:15pmyour adding the total number students from each class. 21 + 32 = 53

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