Q: Mr. Ray has 100 customers waiting at his fish market. He has 10 tuna, each of which weighs 200 pounds. Each customer wants 25 pounds of tuna. Mr. Ray's store is first come, first served. How many customers will go home without any fish?
A: He has 2,000 pounds of fish because 10 x 200 = 2,000. He has enough for 80 customers because 2,000 / 25 = 80. 20 customers go home without any fish because 100 - 80 = 20. The answer is 20.

Q: Julia bought 3 packs of red balls, 10 packs of yellow balls, and 8 packs of green balls. There were 19 balls in each package. How many balls did Julie buy in all?
A: The total number of packages is 3 + 10 + 8 = 21. Julia bought 21 × 19 = 399 balls. The answer is 399.

Q: To make a cherry pie, Veronica needs 3 pounds of pitted cherries. There are 80 single cherries in one pound of cherries.  It takes 10 minutes to pit 20 cherries. How many hours will it take Veronica to pit all the cherries?
A:
There are 80 cherries in a pound and she needs 3 pounds to make a pie so she needs 80 * 3 = 240 cherries. It takes her 10 minutes to pit a unit of 20 cherries. She has 240 / 20 = 12 units of cherries to pit. It takes 10 minutes to pit a unit of cherries and she has 12 units so it will take her 10 * 12 = 120 minutes. 60 minutes are in 1 hour and it takes her 120 minutes so that’s 120 / 60 = 2 hours. The answer is 2.