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Math·Problem-Solving and Data Analysis·Ratios, rates, proportional relationships, and units

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The ratio of cups of flour to cups of butter in a pie dough recipe is $2.75$ to $1$. The ratio of cups of flour to cups of butter in a biscuit recipe is $7$ to $1$. Each recipe has $1$ cup of butter. How many more cups of flour are in the biscuit recipe than in the pie dough recipe?

1

4.25