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Any idea? Please help.

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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Source: — Quantitative Reasoning |
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by shankar.ashwin » Wed Nov 02, 2011 10:02 pm
Resultant is a 1.5% milk obtained from samples of 1%, 2% and 3% milks.

You could obtain a 1.5% mixture by mixing equal quantities of the 1% and 2% milk. (no 3% needed)

Thats is x=y (z is '0' here) Only A satisfies.
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