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Imagine an assembly line with three inspection points A, B

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Manager
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Joined: 25 Feb 2008
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Imagine an assembly line with three inspection points A, B [#permalink] New post 22 Mar 2008, 02:27
Imagine an assembly line with three inspection points A, B and C. Of every 10 unites inspected at point A, 2 are discarded as faulty. Of every 10 unites inspected at point B, 1 is discarded as faulty. Of every 8 unites inspected at point C, 1 is discarded as faulty. Of every 200 unites sent along the assembly line, how many are discarded at three inspection points.
126
115
85
74
54
Please explain your answer.
Optional: time you spend on this question
Director
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Joined: 13 Nov 2003
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Re: assembly line [#permalink] New post 22 Mar 2008, 03:38
Hi,
Think that the ans is : (2/10)*200+ (1/10)*160 + (1/8)*144=40+16+18=74
Senior Manager
Senior Manager
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Re: assembly line [#permalink] New post 22 Mar 2008, 07:07
74
200 -> A takes out 20% -> 160 -> B takes out 10% -> 144 -> C takes out 100/8% -> 126 remain on the ine. So 74 are discarded
Re: assembly line   [#permalink] 22 Mar 2008, 07:07
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Imagine an assembly line with three inspection points A, B

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