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A breaker filled with liquid holds enough to exactly fill 4

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A breaker filled with liquid holds enough to exactly fill 4 [#permalink] New post 02 Feb 2008, 23:47
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A breaker filled with liquid holds enough to exactly fill 4 size A test tubes or seven size B test tubes. If a size A test tube that is full is used to fill a size B test tube, what fraction of the liquid in the larger test tube will be left over ?

1. 3/11
2. 4/11
3. 3/7
4. 4/7
5. 7/11
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Re: breaker [#permalink] New post 03 Feb 2008, 00:11
blog wrote:
A breaker filled with liquid holds enough to exactly fill 4 size A test tubes or seven size B test tubes. If a size A test tube that is full is used to fill a size B test tube, what fraction of the liquid in the larger test tube will be left over ?

1. 3/11
2. 4/11
3. 3/7
4. 4/7
5. 7/11


1/4*A = 1/7*B so 4/4*A = 4/7*B, ->3/7 of B left over
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Director
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Re: breaker [#permalink] New post 03 Feb 2008, 05:09
or if you want to make it into a word problem:

28oz of some liquid
4 size A test tubes = 7oz apiece
7 size B test tubes = 4oz apiece
(7-4)/7 = 3/7

Answer C
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Re: breaker [#permalink] New post 03 Feb 2008, 11:35
just picked numbers to get 3/7

assume beaker holds 28 units and each size a holds 7 units, and each b holds 4 units.

the 7 from a into b leaves 3 units behind, since b take only take in 4 of the 7. left over is 3/7
Re: breaker   [#permalink] 03 Feb 2008, 11:35
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A breaker filled with liquid holds enough to exactly fill 4

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