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4. (GC) If 25/(x/5) = (1/25)/125 then x = ? (A) 5-2 (B) 52

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4. (GC) If 25/(x/5) = (1/25)/125 then x = ? (A) 5-2 (B) 52 [#permalink] New post 15 Mar 2011, 15:40
00:00
A
B
C
D
E

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(N/A)

Question Stats:

25% (01:41) correct 75% (00:45) wrong based on 4 sessions
4. (GC) If 25/(x/5) = (1/25)/125 then x = ?
(A) 5^-2
(B) 5^2
(C) 5^3
(D) 5^8
(E) 5^11
[Reveal] Spoiler: OA

Last edited by banksy on 16 Mar 2011, 08:00, edited 1 time in total.
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Re: 4. (GC) If 25/(x/5) = (1/25)/125 then x = ? (A) 5-2 (B) 52 [#permalink] New post 15 Mar 2011, 17:37
rewrite as:
25*(5/x) = (1/25)*(1/125)
(5^3)/x = (1/(5^2))*(1/(5^3))
1/x = (1/(5^2))*(1/(5^3))*(1/(5^3))
1/x = 1/(5^7)
x = (5^7)

Where did you get that answer?
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Re: 4. (GC) If 25/(x/5) = (1/25)/125 then x = ? (A) 5-2 (B) 52 [#permalink] New post 15 Mar 2011, 20:49
=> 125/x = 1/25 * 1/125

=> x = 5^3 * 5^2 * 5^3 => x = 5^8

Perhaps the answer is D.

I think the answer choices should read 5^-2, 5^2, 5^3, 5^8, 5^11.

@banksy, could you please confirm the answer choices ?
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Re: 4. (GC) If 25/(x/5) = (1/25)/125 then x = ? (A) 5-2 (B) 52 [#permalink] New post 16 Mar 2011, 04:11
Oops, I agree with the (5^8), bad adding skills.
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Re: 4. (GC) If 25/(x/5) = (1/25)/125 then x = ? (A) 5-2 (B) 52 [#permalink] New post 16 Mar 2011, 04:21
Why isnt it

25/(x/5)=(1/25)/125
25*5/x=1/25*1/125
125/x=1/(125)(25)
1/x=1/25
x=25
x=5^2
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Re: 4. (GC) If 25/(x/5) = (1/25)/125 then x = ? (A) 5-2 (B) 52 [#permalink] New post 16 Mar 2011, 04:36
scbguy wrote:
Why isnt it

25/(x/5)=(1/25)/125
25*5/x=1/25*1/125
125/x=1/(125)(25)
1/x=1/25
x=25
x=5^2

\frac{125}{x} = \frac{1}{125*25}

If we cross multiply;

x = 125*125*25

x = 5^3*5^3*5^2

x = 5^{(3+3+2)} = 5^8
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Manager
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Joined: 03 Jun 2010
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Location: Dubai, UAE
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Re: 4. (GC) If 25/(x/5) = (1/25)/125 then x = ? (A) 5-2 (B) 52 [#permalink] New post 16 Mar 2011, 04:59
got it thanks :), i thought we could cancel out 125
Re: 4. (GC) If 25/(x/5) = (1/25)/125 then x = ? (A) 5-2 (B) 52   [#permalink] 16 Mar 2011, 04:59
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4. (GC) If 25/(x/5) = (1/25)/125 then x = ? (A) 5-2 (B) 52

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