Come up with a question and reasoning that would justify [20] as the answer.
The question is: Harry's birthday was three weeks after the closing of the school. His three friends decided to contribute an equal amount of money to throw him a party. Harry added $30 to the contribution, making the total contribution three times as much as Harry contributed. Calculate the total amount of money that each of Harry's friends contributed.
Reasoning: If the total contribution was three times as much as Harry contributed, and Harry contributed $30, the total contribution was 3 * $30 = $90. Since Harry contributed $30, his three friends together contributed $90 - $30 = $60. Since the three friends were contributing an equal amount, each friend contributed $60 / 3 = $20.

Come up with a question and reasoning that would justify [12] as the answer.
The question is: I have purchased 5 blue apples at the store. Suppose my neighbor gives me twice as many yellow apples as I have blue ones, and then I give my son 1/5 of the total number of apples; how many apples do I have now?
Reasoning: The number of blue apples is 5, and if you receive twice as many yellow apples as the number of blue apples, there will be 5 * 2 = 10 yellow apples. After receiving the yellow apples, you now have 10 yellow apples + 5 blue apples = 15 apples. When you give 1 / 5 of the total number of apples to the son, you part with 1 / 5 * 15 = 3 apples. The total number of apples remaining is 15 - 3 = 12 apples.

Come up with a question and reasoning that would justify [1955] as the 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 question is: I bought a TV for $1700 excluding tax. What is the price of the television when calculating 15% of the value-added tax?
Reasoning: The value - added tax is 1700 * 15% = 255. The price of the television including tax 1700 + 255 = $1955.