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GMAT Quantitative Section | Re: Weighted average formula

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We found the total number of boxes in (A+B) as 1600
If we are diving this 1600 by 2 then we will get average number of boxes (NOT per person) of two entities A (400 boxes) and B (1200 boxes)
But we are interested in finding what is the combined average, as per the question the combined average is defined as the number of boxes in a group per person, so we need to divide the total number of boxes (A+B) = 1600 by the total number of people in both the groups (A+B) = 30 to get the
Combined Average
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