Tough question : GMAT Problem Solving (PS)
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# Tough question

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Intern
Joined: 28 Mar 2011
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08 Jun 2011, 05:14
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Difficulty:

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Question Stats:

6% (02:30) correct 94% (00:19) wrong based on 16 sessions

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Stock Number of shares
V 68
W 112
X 56
Y 94
Z 45

The table shows the number of shares of each of the 5 stocks owned by Sami. If Mr. Sami was to sell 20 shares of the stock X and buy 24 shares of Stock Y, waht would the increase in the range of the numbers of shares of the 5 stocks owned by Mr. Sami?

4
6
9
15
20
[Reveal] Spoiler: OA
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08 Jun 2011, 07:32
i am getting the answer D.
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08 Jun 2011, 07:36
agdimple333 wrote:
i am getting the answer D.

It must be D

the old range is 112-45 = 67
selling 20 shares of X = 36 shares
adding 24 sharing of Y = 118 shares

new range is 118-36 = 82

thus difference is 82-67 = 15

Last edited by sudhir18n on 08 Jun 2011, 07:47, edited 1 time in total.
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08 Jun 2011, 07:38
Hyppo wrote:

Stock Number of shares
V 68
W 112
X 56
Y 94
Z 45

The table shows the number of shares of each of the 5 stocks owned by Sami. If Mr. Sami was to sell 20 shares of the stock X and buy 24 shares of Stock Y, waht would the increase in the range of the numbers of shares of the 5 stocks owned by Mr. Sami?

4
6
9
15
20

Range = Max-Min
Presently,
Max=n(W)=112
Min=n(Z)=45
Current Range = 112-45=67

If,
n(X)=56-20=36
n(Y)=94+24=118

Now,
Max=n(Y)
Min=n(X)

Range After the purchase and sell=118-36=82

Increase in Range=82-67=15.

Ans: "D"
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08 Jun 2011, 09:32
V 68
W 112
X 56
Y 94
Z 45

Range = 112-45 = highest - lowest

now

V 68
W 112
X 56-20 = 36
Y 94+24 = 118
Z 45

Range = 118-36

Increase in range = 118-36 -(112-45) = 118-36-112+45 = 6+9 = 15

Answer should be D = 15
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08 Jun 2011, 10:35
Thank you all.

My understanding of what "range" does mean was not correct.
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11 Jun 2011, 05:15
Stock Number of shares New Number for shares
V , 68 , 68
W , 112 , 112
X , 56 , 36
Y , 94 , 118
Z , 45 , 45
RANGE , 112-45=67 , 118-36=82

82-67 = 15

Hence, (D)
Re: Tough question   [#permalink] 11 Jun 2011, 05:15
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