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A factory producing locks has two quality control managers, Harold and

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A factory producing locks has two quality control managers, Harold and  [#permalink]

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New post Updated on: 01 Dec 2019, 06:57
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Difficulty:

  55% (hard)

Question Stats:

22% (01:34) correct 78% (02:23) wrong based on 9 sessions

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A factory producing locks has two quality control managers, Harold and Silvia. All of the locks is examined by both managers. The percentages of errors are 0.08% and 0.05% respectively. If the combined percentage of errors is 0.075%, what fraction of total examinations belongs to Silvia?

A. 1/6
B. 1/5
C. 1/4
D. 1/3
E. 1/2

Originally posted by indu1954 on 01 Dec 2019, 06:53.
Last edited by Bunuel on 01 Dec 2019, 06:57, edited 1 time in total.
Renamed the topic and edited the question.
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Re: A factory producing locks has two quality control managers, Harold and  [#permalink]

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New post 01 Dec 2019, 09:58
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This question can be easily done using the principle of Alligation:
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indu1954 wrote:
A factory producing locks has two quality control managers, Harold and Silvia. All of the locks is examined by both managers. The percentages of errors are 0.08% and 0.05% respectively. If the combined percentage of errors is 0.075%, what fraction of total examinations belongs to Silvia?

A. 1/6
B. 1/5
C. 1/4
D. 1/3
E. 1/2


Attachment:
WhatsApp Image 2019-12-01 at 10.26.01 PM.jpeg
WhatsApp Image 2019-12-01 at 10.26.01 PM.jpeg [ 45 KiB | Viewed 133 times ]

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Re: A factory producing locks has two quality control managers, Harold and   [#permalink] 01 Dec 2019, 09:58
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