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

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Math Expert
Joined: 02 Sep 2009
Posts: 54544
If 5a = 3b = 25, then 30ab =  [#permalink]

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20 Mar 2016, 23:40
00:00

Difficulty:

5% (low)

Question Stats:

94% (00:59) correct 6% (01:17) wrong based on 98 sessions

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

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

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

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21 Mar 2016, 05:07
1
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

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Joined: 02 Mar 2015
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Re: If 5a = 3b = 25, then 30ab =  [#permalink]

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21 Mar 2016, 21:51
1
1
If 5a = 3b = 25, then 30ab =

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

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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31 Aug 2017, 16:59
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, 16:59
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