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If 15 pies cost a total of 511.50, then at this rate, what i

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If 15 pies cost a total of 511.50, then at this rate, what i [#permalink] New post 03 Aug 2018, 10:42
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If 15 pies cost a total of \($11.50\), then at this rate, what is the cost of 9 pies?

(A) $6.75

(B) $6.90

(C) $7.50

(D) $8.50

(E) $9.45
[Reveal] Spoiler: OA

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Re: If 15 pies cost a total of 511.50, then at this rate, what i [#permalink] New post 03 Aug 2018, 17:15
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I think it is not 511.5, the total cost. It should be $11.5, and only then you will get $6.9 as answer:

15 pie costs= $11.5

3 pie will cost= $2.3

9 pie will cost= $2.3*3=$6.9.

Am I correct?
Re: If 15 pies cost a total of 511.50, then at this rate, what i   [#permalink] 03 Aug 2018, 17:15
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