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A store sells pens and pencils. Provided that the price of

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CEO
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A store sells pens and pencils. Provided that the price of [#permalink] New post 30 Oct 2007, 08:17
A store sells pens and pencils.
Provided that the price of each item is expressed as a whole number of cents, how much do 5 pencils cost?

1. 5 pencils and 3 pens cost 30 cents
2. 4 pencils and 4 pens cost 32 cents
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Re: System of Linear Equations [#permalink] New post 30 Oct 2007, 08:29
bmwhype2 wrote:
A store sells pens and pencils.
Provided that the price of each item is expressed as a whole number of cents, how much do 5 pencils cost?

1. 5 pencils and 3 pens cost 30 cents
2. 4 pencils and 4 pens cost 32 cents


A: 5pc + 3pn =30
5x3 + 3x5 =30
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Re: System of Linear Equations [#permalink] New post 30 Oct 2007, 08:45
bmwhype2 wrote:
A store sells pens and pencils.
Provided that the price of each item is expressed as a whole number of cents, how much do 5 pencils cost?

1. 5 pencils and 3 pens cost 30 cents
2. 4 pencils and 4 pens cost 32 cents


I get A.

(1) 5x + 3y = 30
The only solution that fits is x = 3, y = 5. Hence, sufficient.

(2) 4x + 4y = 32
Could be x=4, y=4 OR x=2, y=6. Hence, insufficient.
Re: System of Linear Equations   [#permalink] 30 Oct 2007, 08:45
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A store sells pens and pencils. Provided that the price of

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