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A computer store sells two sizes of laptops, 13-inch and 15-inch. Duri

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Joined: 02 Sep 2009
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A computer store sells two sizes of laptops, 13-inch and 15-inch. Duri  [#permalink]

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New post 21 Apr 2017, 06:48
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A computer store sells two sizes of laptops, 13-inch and 15-inch. During a typical week, the store sells two 13-inch laptops for every 15-inch laptop. However, during the holiday season, the number of 13-inch laptops sold decreases by 50 percent, and the number of 15-inch laptops sold triples. If the store sells 600 laptops per week during the holiday season, how many more 15-inch laptops than 13-inch laptops are sold?

A. 100
B. 150
C. 200
D. 300
E. 400

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Re: A computer store sells two sizes of laptops, 13-inch and 15-inch. Duri  [#permalink]

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New post 21 Apr 2017, 07:29
initial ratio is 2:1

then during holiday the rration becomes 1 : 3

so total sale = 600 = 1x + 3x

4x = 600
x =150..

13 inch = 150..
15 inch = 450

450- 150 = 300
ans D
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Re: A computer store sells two sizes of laptops, 13-inch and 15-inch. Duri   [#permalink] 21 Apr 2017, 07:29
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A computer store sells two sizes of laptops, 13-inch and 15-inch. Duri

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