Step-by-step explanation:
Cat:
15 1/4 - 4 5/8 = 15 - 4 + 1/4 - 5/8 = 11 + 2/8 - 5/8 = 11 - 3/8 = 10 + 8/8 - 3/8 = 10 5/8 pounds
Cat - Carrier
10 5/8 - 4 5/8 = 10 - 4 + 5/8 - 5/8 = 6 pounds
The cats weight is 6 pounds greater than the weight of the carrier.