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

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

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22 Jul 2016, 11:49
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5
00:00

Difficulty:

15% (low)

Question Stats:

89% (01:37) correct 11% (01:54) wrong based on 78 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, 12:09
1
cd = 13
c = 13/d

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

ab = 5

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

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17 Jul 2017, 10:39
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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08 Oct 2018, 00:22
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Re: If ab = 5, bc = 10 and cd = 13, then ad =   [#permalink] 08 Oct 2018, 00:22
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