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Mariko can knit 5 rows of a scarf in x minutes. If there are 100 rows in each foot of the scarf, how many hours, in terms of x and y, will it take Mariko to finish a scarf that is y feet long?
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A$$\frac{xy}{3}$$
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B$$\frac{1200}{xy}$$
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C1200xy
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D$$\frac{3}{xy}$$
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E3xy
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