Reasoning and answer: The cassette tapes will cost 2 9 = $18. She spends 18 + 25 = $43 in total. Josie will have 50 - 43 = $7 left.
The answer: 7
What was the question?
Question: Josie received $50 as a gift. She plans to buy two cassette tapes that cost $9 each and a headphone set that costs $25. How much money will she have left?

Reasoning and answer: There are 9 + 12 = 21 students in a class. Hence, 21 / 3 = 7 groups are formed.
The answer: 7
What was the question?
Question: There are 9 boys and 12 girls in a class. The teacher needs to create groups with three members for their class activity. How many groups are formed?

Reasoning and answer: We let x be the amount of money she put in the bank the first year,. Then the second year was 2 * x,. and the third year was 2 * 2 * x = 4 * x,. and the fourth year was 2 * 2 * 2 * x = 8 * x. And the total amount she put in the bank, $450, is the sum of all four years, or $450 = x + (2 * x) + (4 * x) + (8 * x). This simplifies to $450 = 15 * x. And therefore, the amount of money she put in the bank the first year was x = $30.
The answer: 30
What was the question?
Question:
Missy had a giant piggy bank in her bedroom. Every day she would search the house for change to put in her bank. After 4 years, the bank was opened and it contained $450 in change. If the second, third, and fourth-year she doubled the amount of money she put in the bank from the amount she had put in the previous year, how much money, in dollars, did she put in the bank the first year?