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# If ab = 5, bc = 10 and cd = 13, then ad =

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Director
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Joined: 11 May 2014
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If ab = 5, bc = 10 and cd = 13, then ad =  [#permalink]

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22 Jul 2016, 10:49
Top Contributor
5
00:00

Difficulty:

15% (low)

Question Stats:

88% (01:34) correct 13% (01:54) wrong based on 73 sessions

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If ab = 5, bc = 10 and cd = 13, then ad =

A. 650

B. 65

C. 26

D.$$\frac{50}{13}$$

E. $$\frac{13}{2}$$

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Md. Abdur Rakib

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Re: If ab = 5, bc = 10 and cd = 13, then ad =  [#permalink]

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22 Jul 2016, 11:09
1
cd = 13
c = 13/d

bc = 10
13b/d = 10
b = 10d/13

ab = 5

Manager
Joined: 18 Jan 2017
Posts: 128
Re: If ab = 5, bc = 10 and cd = 13, then ad =  [#permalink]

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17 Jul 2017, 09:39
AbdurRakib wrote:
If ab = 5, bc = 10 and cd = 13, then ad =

A. 650

B. 65

C. 26

D.$$\frac{50}{13}$$

E. $$\frac{13}{2}$$

=====

Given,
ab=5
bc=10
cd=13

Notice a=5/b and c=13/c

substitute ad= (5/b)*(13/c) = [(5*13)/bc] =[(5*13)/10] = 13/2

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Re: If ab = 5, bc = 10 and cd = 13, then ad =  [#permalink]

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07 Oct 2018, 23:22
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: If ab = 5, bc = 10 and cd = 13, then ad =   [#permalink] 07 Oct 2018, 23:22
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