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July 29, 2014

July 29, 2014

Posted by **viri** on Thursday, December 15, 2011 at 8:07pm.

- math - sum and difference -
**MathMate**, Thursday, December 15, 2011 at 9:09pmSum and difference problems can be readily solved without algebra by the following:

bigger number = (sum+difference)/2

smaller number = (sum - difference)/2

Example, since there are more girls than boys, so

number of girls = (35+11)/2 = 23

number of boys = (35-11)/2 = 12

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