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Re: Average DS problem
by Govi Ravi - Thursday, 18 November 2010, 11:22 PM
 

X * A1 + Y * A2 / ( X+Y)

 

A1 & A2 are given in the stem.

 

Combining st1 & st2 we have the values of (X+Y), X, Y. Put them back in the weighted average equation.