Answer:
24 bags can be made from three 5 pounds bags.
Explanation:
Given that:
Three 5 pound bags are donated.
Total weight of bags = 3*5 = 15 pounds 
We know that:
1 pound = 16 ounces 
15 pounds = 16*15 = 240 ounces 
A bag weighs 10 ounces. 
Number of bags = 

Number of bags = 24 bags 
Hence,
24 bags can be made from three 5 pounds bags.