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The product of positive integers b and c is 60. If b is doub

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The product of positive integers b and c is 60. If b is doub [#permalink] New post 02 Oct 2017, 22:27
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100% (00:30) correct 0% (00:00) wrong based on 2 sessions
The product of positive integers b and c is 60. If b is doubled, then c must decrease by what percent so that the product of the two will still equal 60?

(A) 10

(B) 25

(C) 50

(D) 200

(E) Cannot be determined from information given.


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[Reveal] Spoiler: OA
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Re: The product of positive integers b and c is 60. If b is doub [#permalink] New post 03 Oct 2017, 02:49
We know that \(bc = 60\), thus if b is doubled, we get \(2bc' = 60\), where c' is the new value of c. It is easy to see that \(c' = \frac{c}{2}\) in order to keep the product equal to 60. The percentage decrease is computed as \(\frac{\frac{c}{2}-c}{c}*100 = 50%\).

Answer C
Re: The product of positive integers b and c is 60. If b is doub   [#permalink] 03 Oct 2017, 02:49
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The product of positive integers b and c is 60. If b is doub

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