Answer:53
Step-by-step explanation: to find the difference between numbers, you use subtraction. In this case, we subtract the 56 ounces by the 3 ounces. 56-3 is 53
21 ounces
2 pounds is 32 ounces, add the other three ounces
56 - 35 = 21
21 ounces gained in a month
