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If 18 is 15 percent of 30 percent of a certain number, what

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Intern
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If 18 is 15 percent of 30 percent of a certain number, what [#permalink] New post 24 Mar 2013, 11:24
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A
B
C
D
E

Difficulty:

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Question Stats:

84% (01:30) correct 16% (00:06) wrong based on 62 sessions
If 18 is 15 percent of 30 percent of a certain number, what is the number?

(A) 9
(B) 36
(C) 40
(D) 81
(E) 400

Sorry.. i'm quite sure this is a repeat but it's not showing up when i search for it.
[Reveal] Spoiler: OA

Last edited by exploringm on 24 Mar 2013, 13:34, edited 1 time in total.
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Re: if 18 is 15% of 30% of a certain number, what [#permalink] New post 24 Mar 2013, 12:29
I'm getting E.

Got the below equation.

18=0.15(0.3*x)

By solving. x = 400.

Please explain, what's wrong.
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Re: if 18 is 15% of 30% of a certain number, what [#permalink] New post 24 Mar 2013, 12:33
exploringm wrote:
if 18 is 15 percent of 30 percent of a certain number, what is the number?

(A) 9
(B) 36
(C) 40
(D) 81
(E) 400

Maverick_Indian is right: the answer is E

x\frac{15}{100}\frac{30}{100}=18

x=18*\frac{(100*100)}{(15*30)}

x=400
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Intern
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Joined: 25 Dec 2012
Posts: 28
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Kudos [?]: 5 [0], given: 10

Re: if 18 is 15% of 30% of a certain number, what [#permalink] New post 24 Mar 2013, 13:29
Maverick_Indian wrote:
I'm getting E.

Got the below equation.

18=0.15(0.3*x)

By solving. x = 400.

Please explain, what's wrong.


My bad guys, E is the official answer. Typed it in too quickly.

Thanks for the answer
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Kudos [?]: 3 [0], given: 9

Re: if 18 is 15% of 30% of a certain number, what [#permalink] New post 24 Mar 2013, 13:31
Estimate, 18 is 15% (approximately 1/7) 18x7 = 126. Then approximate 30% as 1/3 so 126x3=378, since the answers is so spread answer is E = 400.

I would not use this method is answers is closer to each other.
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Re: if 18 is 15% of 30% of a certain number, what   [#permalink] 24 Mar 2013, 13:31
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If 18 is 15 percent of 30 percent of a certain number, what

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