Posted by **Anonymous** on Saturday, September 3, 2011 at 10:54pm.

the addition of 11 numbers is 66.from them the avarage of 5 numbers is 3.and the avarage of last 5 numbers is 9. what is the 6th numbers?

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**Mgraph**, Saturday, September 3, 2011 at 10:58pm
66-5*3-5*9

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