Given
F a bag contains 10,500 ounces (oz) of sand
Find out how many pounds (lb) does it contain.
To proof
As given in the question
F a bag contains sand = 10,500 ounces (oz)
1 pound = 16 ounces

F a bag contains sand in the pounds

solving the above terms
we get

solving the above
= 656.25 pounds
F a bag contains 656.25 pounds of sand
Hence proved