[Question]: Brendan went fishing with his dad. Brenden caught 8 fish in the morning. He threw 3 back that were too small. He caught 5 more in the afternoon. Brendan's dad caught 13 fish. How many fish did they catch in all?
[Answer]: Brenden caught 8 fish in the morning + 5 in the afternoon = 13 fish. After throwing the small fish back, Brenden has 13 3 = 10 fish. Together, Brenden and his dad caught 10 + 13 = 23 fish.
So the answer is 23.

[Question]: Some friends went hiking for 3.5 hours. They traveled 21 kilometers in that time. Birgit was 4 minutes/km faster than the average time. If Birgit kept the same pace, how many minutes would it take her to go 8 kilometers?
[Answer]: Minutes spent hiking = 3.5 * 60 = 210 minutes. Average speed = 210 minutes / 21 km = 10 minutes / km. Birgit is 4 minutes / km faster = 10 - 4 = 6 min / km. It would take 6 * 8 = 48 minutes to go 8 km. Birgit would take 48 minutes to travel 8 kilometers.
So the answer is 48.

[Question]: Tina decides to fill a jar with coins. In the first hour she puts in 20 coins. During the next two hours she puts in 30 coins each time. During the fourth hour she puts in 40 coins. During the fifth hour her mother asks to borrow some money so she takes 20 coins out. How many coins are left after the fifth hour?
[Answer]:
There are 20 coins during the first hour. 30 coins are added during the second and third hours and 40 coins are added during the fourth hour. By the fourth hour there are 20 + 30 + 30 + 40 = 120 coins. The number of coins after giving 20 to her mother is 120 - 20 = 100.
So the answer is 100.