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The distance between two points is X. The number of inches

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The distance between two points is X. The number of inches [#permalink] New post 07 Mar 2012, 17:30
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38% (02:10) correct 62% (01:07) wrong based on 129 sessions
The distance between two points is X. The number of inches in X is equal to the square root of the number of feet in X (1 foot =12 inches.) What is the length of X, in inches?

A. 144
B. 12
C. 1
D. 1/12
E. 1/144

I'm have problems understanding this question... Please Help!!!

I'll post the official explanation below.
[Reveal] Spoiler: OA

Last edited by rsaraiya on 07 Mar 2012, 17:39, edited 1 time in total.
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Re: The distance between two points is X - Master GMAT [#permalink] New post 07 Mar 2012, 21:59
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rsaraiya wrote:
The distance between two points is X. The number of inches in X is equal to the square root of the number of feet in X (1 foot =12 inches.) What is the length of X, in inches?

(a) 144
(b) 12
(c) 1
(d) 1/12
(e) 1/144

I'm have problems understanding this question... Please Help!!!

I'll post the official explanation below.


Say # of inches in X is a, then # of feet in X is \frac{a}{12}, (since 1 foot =12 inches).
Question: the length of X, in inches = a = ?

We are told that a is equal to the square root of \frac{a}{12} --> a=\sqrt{\frac{a}{12}} --> a^2=\frac{a}{12} --> a=\frac{1}{12}.

Answer: D.
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Re: The distance between two points is X - Master GMAT [#permalink] New post 07 Mar 2012, 17:34
rsaraiya wrote:
The distance between two points is X. The number of inches in X is equal to the square root of the number of feet in X (1 foot =12 inches.) What is the length of X, in inches?

(a) 144
(b) 12
(c) 1
(d) 1/12
(e) 1/144

Have problems understanding this question... Please Help!!!

I'll post the official explanation below.


Here is Master GMAT's explanation... I couldn't really follow their steps... I kept getting (a)

If X is 1/12 inches long, there are [(1/12)inches /12] = [1/144]ft in X. Since (1/12) = Sqrt(1/144) the number of inches is equal to the square root of the number of feet in X, and this is the correct answer.
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Re: The distance between two points is X - Master GMAT [#permalink] New post 07 Mar 2012, 23:10
Bunuel wrote:
rsaraiya wrote:
The distance between two points is X. The number of inches in X is equal to the square root of the number of feet in X (1 foot =12 inches.) What is the length of X, in inches?

(a) 144
(b) 12
(c) 1
(d) 1/12
(e) 1/144

I'm have problems understanding this question... Please Help!!!

I'll post the official explanation below.


Say # of inches in X is a, then # of feet in X is \frac{a}{12}, (since 1 foot =12 inches).
Question: the length of X, in inches = a = ?

We are told that a is equal to the square root of \frac{a}{12} --> a=\sqrt{\frac{a}{12}} --> a^2=\frac{a}{12} --> a=\frac{1}{12}.

Answer: D.


Thanks. That actually makes sense!
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Re: The distance between two points is X - Master GMAT [#permalink] New post 05 Feb 2013, 20:03
Bunuel wrote:
rsaraiya wrote:
The distance between two points is X. The number of inches in X is equal to the square root of the number of feet in X (1 foot =12 inches.) What is the length of X, in inches?

(a) 144
(b) 12
(c) 1
(d) 1/12
(e) 1/144

I'm have problems understanding this question... Please Help!!!

I'll post the official explanation below.


Say # of inches in X is a, then # of feet in X is \frac{a}{12}, (since 1 foot =12 inches).
Question: the length of X, in inches = a = ?

We are told that a is equal to the square root of \frac{a}{12} --> a=\sqrt{\frac{a}{12}} --> a^2=\frac{a}{12} --> a=\frac{1}{12}.

Answer: D.


Thank you for the explanation, very helpful, but is this really a sub-600 level question?
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Re: The distance between two points is X. The number of inches [#permalink] New post 24 May 2013, 08:10
Inches = sq root of feet and not the other way around. It is worded to be misleading.
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Re: The distance between two points is X. The number of inches [#permalink] New post 26 May 2013, 06:19
hatespamners wrote:
Inches = sq root of feet and not the other way around. It is worded to be misleading.

Even i also have the same doubt.

12 inches make 1 feet

logically, the value of # of inches should have square root as against the larger denomination feet...
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Re: The distance between two points is X. The number of inches [#permalink] New post 01 Sep 2014, 04:54
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Re: The distance between two points is X. The number of inches   [#permalink] 01 Sep 2014, 04:54
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