how much of the mixture is to be removed

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uptowngirl92: Master | Next Rank: 500 Posts; Posts: 447; Joined: Sun Apr 19, 2009 9:08 pm; Location: Kolkata,India; Thanked: 7 times; GMAT Score:670

by uptowngirl92 » Wed Oct 28, 2009 5:47 pm

10kg of a mixture contains 30% sand and 70% clay. In order to make the mixture contain equal quantities of clay and sand. how much of the mixture is to be removed and replaced with pure sand?

Detailed explanation please.

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Source: Beat The GMAT — Problem Solving | Wed Oct 28, 2009 5:47 pm

Testluv: GMAT Instructor; Posts: 1302; Joined: Mon Oct 19, 2009 2:13 pmFollowed by: 164 members; Location: Toronto; Thanked: 539 times; GMAT Score:800

by Testluv » Wed Oct 28, 2009 5:58 pm

Hi uptowngirl92,

Unfortunatley, the question, as posted, has an infinite number of possibly correct answers. For example, we can remove nothing, and simply add 4kg of sand...Do we need to maintain the total at 10kg or not...either the question has been improperly transcribed or else improperly posed...also please post the answer choices, as using answer choices is a great strategy that great test-takers regularly use!

Kaplan Teacher in Toronto

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