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Company S produces two kinds of stereos: basic and deluxe.

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Manager
Joined: 10 Oct 2005
Posts: 113
Location: Hollywood
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Company S produces two kinds of stereos: basic and deluxe.  [#permalink]  30 Sep 2006, 12:41
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Company S produces two kinds of stereos: basic and deluxe. Of the stereos produced by company S last month, 2/3 were basic and the rest were deluxe. If it takes 7/5 as many hours to produce a deluxe stereo as it does to produce a basic stereo, then the number of hours it took to produce the deluxe stereos last month was what fraction of the total number of hours it took to produce all the stereos?

A- 7/17
B- 14/31
C- 7/15
D- 17/35
E- 1/2
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GMAT Instructor
Joined: 04 Jul 2006
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[#permalink]  30 Sep 2006, 13:07
Great question for picking numbers. Suppose that they produced one deluxe stereo and that it took 7 hours to make. Then the two basic stereos each took 5 hours to make. This makes for a total to 17 hours, of which seven were devoted to making the deluxe.

Manager
Joined: 25 May 2006
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[#permalink]  30 Sep 2006, 13:12
A:7/17

Lets say that the Total of steros produced were 15

B=15/3*2=10
D=5

Then lets say that the Total of hrs to produce one Basic stereo is 10hrs

B=10*10=100hrs
D=10/5*7=14hrs/stereo --> 14*5=70hrs
Total=170

--> 70/170 = 7/17
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[#permalink] 30 Sep 2006, 13:12
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Company S produces two kinds of stereos: basic and deluxe.

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