A party store has 54 packs of plates in stock in either sets of 8 or of 12. If there are 496 total plates in stock, then how many plates would a customer buy, if he buys all of the packs of 12 that the store has in stock?
A
16
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B
38
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C
192
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D
304
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Solution
The correct option is B192 Let the total number of packs of 12 plates be x.
Hence, the total number of packs of 8 plates will be 54−x.
Therefore 8(54−x)+12x=496
⇒432−8x+12x=496
⇒4x=64
⇒x=16
Hence, the store has 16 packs of 12 plates.
Thus, if a customer buys all the packs of 12 plates, then he will buy 12×16=192 plates in total.