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March 5, 2015

March 5, 2015

Posted by **jerson** on Monday, September 8, 2008 at 8:24pm.

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. -
**Damon**, Tuesday, September 9, 2008 at 3:03amYou left out the parenthesis

(21 * 87 + 32 * 81)/53= 83.4

53 is the total number of students, 21+32

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