Final answer:
To determine the amount of sugar Stacy would need for 3 1/5 batches of cookies, you multiply 2 cups of sugar (the amount needed per batch) by 3 1/5, resulting in 6 2/5 cups of sugar.
Step-by-step explanation:
The question asks how much sugar Stacy would use to make 3 1/5 batches of her lemon cookie recipe that calls for 2 cups of sugar per batch. To find the total amount of sugar needed, we multiply the number of batches by the amount of sugar used per batch:
2 cups/batch × 3 1/5 batches = 2 cups/batch × 16/5 batches
After multiplying the fractions, we get:
2 × 16/5 = 32/5 = 6 2/5 cups of sugar
So, Stacy would use 6 2/5 cups of sugar for 3 1/5 batches of her cookies.