Answer:
b = 712 cups of water
Explanation:
First, you have to multiply 68 by 9. This is because there are 68 cups at each rest stop, and there are 9 rest stops. We are finding the total number of cups of water at all the rest stops.
68 • 9 = 612
There are 100 cups of water at the finish line, so add 612 and 100.
612 + 100 = 712
Therefore, there are 712 cups of water.