[Question]Parker is 4 inches shorter than Daisy. Daisy is 8 inches taller than Reese. If Reese is 60 inches tall, what is the average height for the three of them?
[Answer]Since Daisy is 6 inches taller than Reese, she must be 60 inches + 8 inches = 68 inches tall. Parker is 4 inches shorter than Daisy, making her 68 inches – 4 inches = 64 inches. The average height of the three of them is (60 inches + 68 inches + 64 inches) / 3 = 64 inches. The answer is 64.

[Question]Tina is working on her homework when she realizes she's having a hard time typing out her answers on her laptop because a lot of the keys are sticky. She is trying to get her homework done before dinner, though, so she needs to decide if she has time to clean her keyboard first. Tina knows her assignment will only take 10 minutes to complete. Dinner will be ready at 5:30 p.m. Tina decides to time how long it takes to remove and clean one key and will then multiply that time by how many keys she needs to fix. She counts 15 keys that are sticky and times it to take 3 minutes to clean one. After Tina has cleaned one key, there are 14 left to clean. How many minutes total will it take for Tina to both clean the remaining keys and finish her assignment?
[Answer]Tina has already cleaned one key so she has 14 left which take 3 minutes each to clean, 14 x 3 = 42 minutes to clean all the keyboard keys. Her assignment will take 10 minutes to complete, so she needs 42 minutes + 10 minutes = 52 minutes total before dinner. The answer is 52.

[Question]Tim buys 3 dozen eggs. Eggs cost $.50 each. How much did he pay for eggs?
[Answer]He bought 3 * 12 = 36 eggs. So they cost 36 * .5 = $18. The answer is 18.

[Question]The vending machine fails to drop a snack when it’s purchased one in six times. One in ten times, it will accidentally drop two snacks. The rest of the time, it drops the purchased snack. If thirty people have used the vending machine once each to purchase a snack, how many snacks has the vending machine dropped?
[Answer]

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The vending machine has been used 30 times, so it has failed to drop a snack 30 / 6 = 5 times. The vending machine has dropped 2 snacks 30 / 10 = 3 times. It has operated normally and dropped 1 snack 30 - 5 - 3 = 22 times. Thus, the vending machine has dropped 22 + 3 * 2 = 22 + 6 = 28 snacks in thirty uses. The answer is 28.