Answer: A: 656.25 lb
The bag contains 656.25 lb of sand.
Explanation:
Given: A bag contains sand = 10,500 ounces
Also , 1 pound = 16 ounces.
Therefore to convert the given value to pounds, we need to divide the given value of ounces by 16, we get

Hence, the bag contains 656.25 lb of sand.