4 and 1/8
Step by step explanation:
You convert 3/4 and 7/8 to the LCM (Lowest Common Denominator) which would be 8 so
3/4 = 6/8 + 7/8= 13/8 = 1 and 5/8 pounds
Then you add 2 and 1/2 pounds to 1 and 5/8 pounds ,but again u need the LCM which would be 8 so 2 1/2 = 2 4/8 pounds
2 4/8 pounds + 1 and 5/8 pounds = 4 and 1/8 pounds
Sorry if it’s wrong