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If 5a = 3b = 25, then 30ab =

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If 5a = 3b = 25, then 30ab = [#permalink]

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New post 20 Mar 2016, 22:40
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A
B
C
D
E

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  5% (low)

Question Stats:

86% (00:38) correct 14% (00:28) wrong based on 86 sessions

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Re: If 5a = 3b = 25, then 30ab = [#permalink]

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Bunuel wrote:
If 5a = 3b = 25, then 30ab =

A. 50
B. 100
C. 625
D. 1000
E. 1250


5a * 3b = 25 * 25 = 625

15 ab = 625
i.e. 30 ab = 1250

Answer: Option E
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Re: If 5a = 3b = 25, then 30ab = [#permalink]

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New post 21 Mar 2016, 20:51
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If 5a = 3b = 25, then 30ab =

A. 50
B. 100
C. 625
D. 1000
E. 1250

Answer E:

5a = 25 ( A=5)
3b = 25 (b=25/3)

30*a*b = 30*5*(25/3)
= 10*5*25 = 1250 Option E
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Re: If 5a = 3b = 25, then 30ab = [#permalink]

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New post 18 Aug 2017, 15:26
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Re: If 5a = 3b = 25, then 30ab = [#permalink]

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New post 31 Aug 2017, 15:59
Bunuel wrote:
If 5a = 3b = 25, then 30ab =

A. 50
B. 100
C. 625
D. 1000
E. 1250


use fractions

(25/3) * 3 =25
5(5) =25

(25/3) * 5 * 30 =1250

e
Re: If 5a = 3b = 25, then 30ab =   [#permalink] 31 Aug 2017, 15:59
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