David H. answered 01/11/17
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If 1 batch of cookies requires 3/4 cup of brown sugar then 5 batches requires 5 times as much sugar.
3/4 * 1 = 3/4 cup sugar for 1 batch.
3/4 * 5 = 15/4 = 3 and 3/4 cups sugar for 5 batches.