Final answer:
The total weight of the 3 bags of grapes is 12 3/5 pounds.
Step-by-step explanation:
To find the total weight of the 3 bags of grapes, we need to multiply the weight of each bag by the number of bags. Given that each bag weighs 4 1/5 pounds, we can use the mixed number 4 1/5 as a fraction to simplify the calculation. Converting the mixed number to an improper fraction, we get 21/5.
Multiplying the weight of each bag (21/5 pounds) by the number of bags (3), we get (21/5) * 3 = 63/5 = 12 3/5 pounds. Therefore, all 3 bags of grapes weigh 12 3/5 pounds.