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The numbers a, b, c, and d are all positive, and J = a/b and

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The numbers a, b, c, and d are all positive, and J = a/b and  [#permalink]

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New post Updated on: 12 Apr 2013, 05:20
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48% (02:22) correct 52% (02:15) wrong based on 27 sessions

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The numbers a, b, c, and d are all positive, and J = a/b and K = c/d. Is J greater than K?

(1) a < b, c < d, and c > a
(2) a + 7 = c and b + 4 = d


please explain your answer thoroughly....

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Originally posted by atalpanditgmat on 12 Apr 2013, 04:56.
Last edited by Bunuel on 12 Apr 2013, 05:20, edited 1 time in total.
Renamed the topic and edited the question.
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Re: The numbers a, b, c, and d are all positive, and J = a/b and  [#permalink]

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New post 12 Apr 2013, 05:39
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The numbers a, b, c, and d are all positive, and J = a/b and K = c/d. Is J greater than K?

The question asks whether \(\frac{a}{b}>\frac{c}{d}\). Since all unknowns are positive we can safely cross-multiply: is \(ad>bc\)?

(1) a < b, c < d, and c > a. If a=1, b=2, c=2, and d=3, then \(ad=3<4=bc\) (answer NO) but if a=1, b=2, c=2, and d=5, then \(ad=5>4=bc\). Not sufficient.

(2) a + 7 = c and b + 4 = d. The question becomes: is \(a(b+4)>b(a+7)\)? --> is \(ab+4a>ab+7b\)? --> is \(4a>7b\)? We have no additional info to determine that. Not sufficient.

(1)+(2) The question from (2) became "is \(4a>7b\)?" and (1) says that \(a<b\), thus the answer to the question is NO. Sufficient.

Answer: C.

Hope it's clear.
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Re: The numbers a, b, c, and d are all positive, and J = a/b and  [#permalink]

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Re: The numbers a, b, c, and d are all positive, and J = a/b and   [#permalink] 22 Mar 2019, 20:32
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