To find out how many cups of sugar were left in the mixing bowl after NeNe spilled some, we can follow these steps:
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Calculate the amount of sugar in the tripled recipe: \[ 3.25 , \text{cups} \times 3 = 9.75 , \text{cups} \]
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Subtract the amount of sugar that spilled: \[ 9.75 , \text{cups} - 2.46 , \text{cups} = 7.29 , \text{cups} \]
Thus, the number of cups of sugar left in the mixing bowl is 7.29 cups.
The correct answer is B. 7.29.