Question: Mary goes with her 3 children to the circus. Tickets cost $2 for adults and $1 for children. Mary pays with a $20 bill. How much change will she receive?
Answer: Mary's ticket costs $2 / ticket * 1 ticket = $2. Mary's children's tickets cost 3 tickets * $1 = $3. Together the tickets cost $2 + $3 = $5. After paying with a 20 - dollar bill, Mary will receive $20 - $5 = $15. The answer is 15.

Question: 5,000 people live in a small town. 2,000 males live in that town and the rest of the population are females. Thirty percent of the female population wears glasses. How many females wear glasses?
Answer: There are 5,000 - 2,000 = 3,000 females that lives in the town. Since thirty percent of the female population wears glasses, 30 / 100 * 3,000 = 900 females wear glasses. The answer is 900.

Question: Tom decides to make lasagna with all his beef. It takes twice as many noodles as beef. He has 10 pounds of beef. He already has 4 pounds of lasagna noodles and the noodles come in 2-pound packages. How many packages does he need to buy?
Answer: He needs 10 * 2 = 20 pounds of noodles. That means he needs to buy 20 - 4 = 16 pounds of noodles. So he needs to buy 16 / 2 = 8 packages. The answer is 8.

Question: Kevin has a shoebox filled with toads. Every day, Kevin feeds each toad 3 worms. It takes Kevin 15 minutes to find each worm. If it takes Kevin 6 hours to find enough worms to feed all of his toads, how many toads does Kevin have in his shoebox?
Answer:
If it takes 15 minutes to find each worm, then he catches 60 / 15 = 4 worms per hour. In 6 hours, Kevin catches 4 * 6 = 24 worms. If he feeds each toad 3 worms, then he has 24 / 3 = 8 toads in his shoebox. The answer is 8.