Question: I would love to understand how to solve this problem: 200 pounds of carrots are to be distributed to 40 restaurants in a certain city. Each restaurant is to receive 2 pounds of carrots. How many pounds of carrots will not be used?
Can you explain?
Answer: 
The restaurants need 40 * 2 = 80 lbs. of carrots.
So 200 - 80 = 120 lbs. of carrots will not be used.