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# A 7.5 liter mixture of water and sugar is 60% sugar. If 1.5

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A 7.5 liter mixture of water and sugar is 60% sugar. If 1.5 [#permalink]

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08 Jan 2013, 13:08
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A 7.5 liter mixture of water and sugar is 60% sugar. If 1.5 liters of water is added, approximately what is the % of the new mixture of sugar?

A. 40%
B. 50%
C. 63%
D. 64%
E. 68

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[Reveal] Spoiler: OA

Last edited by Bunuel on 09 Jan 2013, 03:19, edited 1 time in total.
Renamed the topic and edited the question.
Manager
Joined: 18 Oct 2011
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Concentration: Entrepreneurship, Marketing
GMAT Date: 01-30-2013
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Re: A 7.5 litre mixture of water and sugar is 60%sugar.if 1.5 li [#permalink]

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08 Jan 2013, 13:23
multiply 7.5 by 10...so 75 Liters of solution which is 30 L Water and 45L Sugar

If you add 1.5x10 (15 L) of water the overall solution will contain 90L. Of that 90L 45L is water and 45 L is sugar.

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Re: A 7.5 litre mixture of water and sugar is 60%sugar.if 1.5 li [#permalink]

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08 Jan 2013, 13:32
Ya sambam ofcos the official answer is B.50 percent but am not satisified with how i got it..this is how i did it.if 7.5 =60% therefore 1.5 would equal 12.i decided to represent 1.5 as 1 part of water and hence in 7.5 i had 5 parts of water..the addition of water will made the new mixture to have 6 parts of water and a less percentage of sugar when i added 1.5 litres.. I said to myself that if 5 parts of water represent 60percent sugar then 6 parts will have to represent a small percentage of sugar i.e (5*60/6)%..thanks for making it clear to me!:-)

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Re: A 7.5 litre mixture of water and sugar is 60%sugar.if 1.5 li   [#permalink] 08 Jan 2013, 13:32
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# A 7.5 liter mixture of water and sugar is 60% sugar. If 1.5

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