[Question]Twice Betty's age is the cost of a pack of nuts. Doug, Betty's friend, is 40 years old. If the sum of their ages is 90, and Betty wants to buy 20 packs of the nuts, calculate the amount of money she'll pay for the packs of nuts.
[Answer]If Doug, Betty's friend, is 40 years old, and the sum of their ages is 90, Betty is 90 - 40 = 50 years old. Since twice Betty's age is the cost of a pack of nuts, a pack of nuts is sold at 2 * $50 = $100. If Betty wants to buy 20 packs of the nuts, she'll have to pay 20 * $100 = $2000. The answer is 2000.
Q: Amoli and Anayet must travel 369 miles together. Amoli drove 42 miles an hour for 3 hours and Anayet drove at 61 miles an hour for 2 hours. How many miles do they still need to travel?
A: Amoli = 42 * 3 = 126 miles. Anayet = 61 * 2 = 122. Together = 126 + 122 = 248 miles. 369 - 248 = 121 miles. They still have 121 miles to travel. The answer is 121.
Question: A concert ticket costs $40. Mr. Benson bought 12 tickets and received a 5% discount for every ticket bought that exceeds 10. How much did Mr. Benson pay in all?
Answer: Mr. Benson had a 5% discount for each of the 12 - 10 = 2 tickets. So, those two tickets had a $40 x 5 / 100 = $2 discount each. Hence, each ticket cost $40 - $2 = $38 each. Thus, two discounted tickets amount to $38 x 2 = $76. And the other ten tickets amount to $40 x 10 = $400. Hence, Mr. Benson paid a total of $400 + $76 = $476. The answer is 476.
[Question]Archie is playing with his marbles outside. He loses 60% of them into the street. Of the remaining ones, he loses half down a sewer. If he has 20 left, how many did he start with?
[Answer]He had 40 before losing them into the sewer because 20 x 2 = 40. He started with 100 because 40 / .4 = 100. The answer is 100.
Q: Trent caught 180 tadpoles then let 75% of them go. How many did he keep?
A: First find the number of tadpoles Trent released: 180 tadpoles * .75 = 135 tadpoles. Then subtract the number he let go from the total number to find the number of tadpoles he keeps: 180 tadpoles - 135 tadpoles = 45 tadpoles. The answer is 45.
Question: Martha has 20 apples. She decided to split them among her friends. Jane got 5 apples from her, and James got 2 more than Jane. How many more apples would Martha need to give away to be left with only 4 of them?
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.
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Martha gave James 5 + 2 = 7 apples. So Martha was left with 20 - 5 - 7 = 8 apples. To be left with only 4 apples, Martha would need to give away 8 - 4 = 4 more apples. The answer is 4.