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September 3, 2014

September 3, 2014

Posted by **Tom** on Friday, April 20, 2012 at 3:32pm.

- Math -
**bobpursley**, Friday, April 20, 2012 at 3:58pmwell, the fraction of white is 1-red-blue

= 1-2/5-1/3=15/15-6/15 - 5/15= (15-11)/15=4/15

but 4/15 N=12 or

N= 12*15/4=45 marbles

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