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gracie
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Your question is discussed before:
https://gmatclub.com/forum/a-feed-store-sells-two-varieties-of-birdseed-brand-a-which-88125.html

you can do it fast using allegation method,
Attachment:
Allegation.png
Allegation.png [ 2.62 KiB | Viewed 1009 times ]
so ratio of A:B is 3:2, and A is 3/5 of the total mix or 60%
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800ers
Weighted averages

A feed store sells two varieties of birdseed: Brand A, which has 40% millet and 60% sunflower, and Brand B which is 65% Millet and 35% sunflower. If a customer purchases a mix of A and B such that it is 50% millet, what is the percent of the mix is Brand A?

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Discussed here: a-feed-store-sells-two-varieties-of-birdseed-brand-a-which-88125.html

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