When Trevor is 11, his older brother will be 11 x 3 = 33 years old. Trevor’s older brother is 20 - 11 = 9 years older than Trevor. Since Trevor is 9 years younger, Trevor will be 33 - 9 = 24 years old.
The answer: 24
Reverse engineering the question: Trevor is currently 11 years old and his older brother is 20 years old. How old will Trevor be when his older brother is three times as old as Trevor is now?


Reasoning and answer: The number of flowers in Peter’s garden is 20 * 3 = 60 flowers. The number of flowers left after he gave his brother 15 flowers is 60 – 15 = 45 flowers.
The answer: 45
What was the question?
Question: Amanda’s garden contains 20 flowers and Peter’s garden contains three times as many flowers as Amanda's. If Peter gave 15 flowers to his brother, how many flowers are left in his garden?


The total pay per employee in a day is 12 * 10 = $120. An employee works for 5 * 4 = 20 days in a month. The total amount of money paid to each employee monthly is 20 * 120 = $2400. When the number of employees increased to 500 + 200 = 700 after the new hires in August. The company pays a total of 700 * 2400 = $1680000 per month to its employees.
The answer: 1680000
Reverse engineering the question: A company has 500 employees, each paid $12 per hour, working 10 hours a day, five days a week, 4 weeks a month. In August, the amount of work increased, and the company hired 200 more people. How much money does the company pay in total per month after the new hires?


Reasoning and answer: Leo has 56 + 20 = 76 marbles. Therefore, there are 56 + 76 = 132 marbles in the jar.
The answer: 132
What was the question?
Question: Two boys, Ben and Leo, are fond of playing marbles. Ben has 56 marbles, while Leo has 20 more marbles than Ben. They put the marbles in one jar. How many marbles in the jar?


Mary's ticket costs $2 / ticket * 1 ticket = $2. Mary's children's tickets cost 3 tickets * $1 = $3. Together the tickets cost $2 + $3 = $5. After paying with a 20 - dollar bill, Mary will receive $20 - $5 = $15.
The answer: 15
Reverse engineering the question: Mary goes with her 3 children to the circus. Tickets cost $2 for adults and $1 for children. Mary pays with a $20 bill. How much change will she receive?


Before Samuel walked across the porch, there were 331 - 223 = 108 dust particles. Those 108 were 1 / 10 of the original amount, so there were 108 * 10 = 1080 dust particles on the porch before Samuel swept.
The answer: 1080
Reverse engineering the question:
Samuel swept the porch and cleared nine-tenths of the dust particles from it. As he walked across the porch afterward, his shoes left 223 dust particles behind. How many dust particles were on the porch before Samuel swept if there were 331 after he walked across it?