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Four staff members at a certain company worked on a project

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Four staff members at a certain company worked on a project [#permalink] New post 27 Feb 2012, 09:03
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78% (02:29) correct 22% (01:24) wrong based on 88 sessions
Four staff members at a certain company worked on a project. The amounts of time that the four staff members worked on the project were in the ratio 2 to 3 to 5 to 6. If one of the four staff members worked on the project for 30 hours, which of the following CANNOT be the total number of hours that the four staff members worked on the project?

A. 80
B. 96
C. 160
D. 192
E. 240
[Reveal] Spoiler: OA
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Re: Four staff members at a certain company worked on a project [#permalink] New post 27 Feb 2012, 12:31
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BANON wrote:
Four staff members at a certain company worked on a project. The amounts of time that the four staff members worked on the project were in the ratio 2 to 3 to 5 to 6. If one of the four staff members worked on the project for 30 hours, which of the following CANNOT be the total number of hours that the four staff members worked on the project?

A. 80
B. 96
C. 160
D. 192
E. 240


A:B:C:D=2x:3x:5x:6x, for some positive number x. Total time 2x+3x+5x+6x=16x.

If 2x = 30 then 16x = 240;
If 3x = 30 then 16x = 160;
If 5x = 30 then 16x = 96;
If 6x = 30 then 16x = 80;

Only answer choices which is not obtained is 192.

Answer: D.
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Re: Four staff members at a certain company worked on a project [#permalink] New post 20 Mar 2012, 23:16
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well 192 is a multiple of 16, where x=12.
since for x=12, no person in the company can have worked 30 hrs, hence 192 cannot be the total hours...
that is my understanding... am i correct???
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Re: Four staff members at a certain company worked on a project [#permalink] New post 20 Mar 2012, 23:29
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monalimishra wrote:
well 192 is a multiple of 16, where x=12.
since for x=12, no person in the company can have worked 30 hrs, hence 192 cannot be the total hours...
that is my understanding... am i correct???


That's correct. Another approach is given in my previous post.
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Re: Four staff members at a certain company worked on a project [#permalink] New post 12 Sep 2013, 08:41
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Re: Four staff members at a certain company worked on a project [#permalink] New post 19 May 2014, 22:57
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Bunuel, 29% got it wrong. Is it sub600? thanks
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Re: Four staff members at a certain company worked on a project [#permalink] New post 19 May 2014, 23:51
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Re: Four staff members at a certain company worked on a project   [#permalink] 19 May 2014, 23:51
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