Final answer:
The three watermelons that Kelly bought for the class picnic weighed 42 pounds.
Step-by-step explanation:
The weight of the three watermelons that Kelly bought for the class picnic is option A) 12 1/2 pounds, 13 3/4 pounds, and 15 3/4 pounds. To find the total weight, we need to add the weights of the three watermelons together. Let's convert the fractions to a common denominator and add the weights:
12 1/2 pounds + 13 3/4 pounds + 15 3/4 pounds = 12.5 pounds + 13.75 pounds + 15.75 pounds = 42 pounds.
So, the three watermelons that Kelly bought for the class picnic weighed 42 pounds.