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17 Jul 2016, 11:32
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B
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35%
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Question Stats:
71% (01:38) correct
29%
(01:32)
wrong
based on 152
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If a, b, c, and d are positive numbers, and \(\frac{a}{b} = \frac{c}{d}\), what is the value of a/b?
(1) \(\frac{2a}{c} - \frac{b}{d} = \frac{b}{d}\)
(2) \(25c^2 = 8d^2\)
(1) \(\frac{2a}{c} - \frac{b}{d} = \frac{b}{d}\)
(2) \(25c^2 = 8d^2\)
gauravsaggis1
Joined: 30 Jun 2014
Last visit: 28 Mar 2017
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WE:Operations (Energy)
17 Jul 2016, 12:52
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from 1.
a/b= c/2d so not sufficient
from statement 2 alone we can find the value of c/d.(all are positive only)
and a/b=c/d so, sufficient
ANS B
a/b= c/2d so not sufficient
from statement 2 alone we can find the value of c/d.(all are positive only)
and a/b=c/d so, sufficient
ANS B
17 Jul 2016, 20:17
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stem: \(\frac{a}{b}\)=\(\frac{c}{d}\).....(1)
\(\frac{a}{b}\)=? or \(\frac{c}{d}\)=?
stat-1: \(\frac{2a}{c}\)-\(\frac{b}{d}\)=\(\frac{b}{d}\)
or \(\frac{2a}{c}\)=\(\frac{2b}{2d}\)
or \(\frac{a}{b}\)=\(\frac{c}{d}\), same equation as given one at stem, .....insufficient.
stat-2: 25 c^2=8d^2
or \(\frac{c}{d}\)=sqrt\(\frac{8}{25}\)
in DS only positive root is accepted,......sufficient
ANS : B
\(\frac{a}{b}\)=? or \(\frac{c}{d}\)=?
stat-1: \(\frac{2a}{c}\)-\(\frac{b}{d}\)=\(\frac{b}{d}\)
or \(\frac{2a}{c}\)=\(\frac{2b}{2d}\)
or \(\frac{a}{b}\)=\(\frac{c}{d}\), same equation as given one at stem, .....insufficient.
stat-2: 25 c^2=8d^2
or \(\frac{c}{d}\)=sqrt\(\frac{8}{25}\)
in DS only positive root is accepted,......sufficient
ANS : B
