Two $20 bills amount to $20 x 2 = $40. Three $5 bills amount to $5 x 3 = $15. So, Marj has $40 + $15 + $4.50 = $59.50 in her wallet. If she buys a cake, she will be left with $59.50 - $17.50 = $42.
The answer: 42
Reverse engineering the question: Marj has two $20 bills, three $5 bills, and $4.50 in loose coins in her wallet. If she buys a cake that costs $17.50, how much money will be left in her wallet?


Reasoning and answer: Half of 318 is 159. 159 + 18 = 177 stairs. 318 + 177 = 495. Together they climbed 495 stairs yesterday.
The answer: 495
What was the question?
Question: Samir climbed 318 stairs yesterday. Veronica climbed 18 more than half that amount. How many stairs did Veronica and Samir climb together yesterday?


Half of Tanya's 20 erasers are red, so she has 20 / 2 = 10 red erasers. One - half as many erasers as Tanya has red erasers is 10 / 2 = 5 red erasers. Rachel's three less than one - half as many erasers as Tanya's red erasers, which is 5 - 3 = 2 erasers. Hanna has twice as many erasers as Rachel, for a total of 2 * 2 = 4 erasers.
The answer: 4
Reverse engineering the question: Hanna has twice as many erasers as Rachel. Rachel has three less than one-half as many erasers as Tanya has red erasers. If Tanya has 20 erasers, and half of them are red, how many erasers does Hanna have?


Reasoning and answer: He paid for 20 / 10 = 2 hours. That means the hourly fee was 30 * 2 = $60. So the total cost was 60 + 20 = $80.
The answer: 80
What was the question?
Question: Jefferson hires a carriage to go to the church. It is 20 miles away. The horse can go 10 miles per hour. It cost $30 per hour plus a flat fee of $20. How much did he pay for the carriage?


There are 9 indoor tables * 10 chairs = 90 chairs. There are 11 outdoor tables * 3 chairs = 33 chairs. The total number of chairs is 90 chairs + 33 chairs = 123 chairs.
The answer: 123
Reverse engineering the question: A cafe has 9 indoor tables and 11 outdoor tables. Each indoor table has 10 chairs, and each outdoor table has 3 chairs. How many chairs are there in all?


Jonah spent 6 x $3 = $18. He made a total of 6 x 12 = 72 pineapple rings. He sold 72 / 4 = 18 sets of pineapple rings. He made 18 x $5 = $90. His profit was $90 - $18 = $72.
The answer: 72
Reverse engineering the question:
Jonah bought 6 pineapples for $3 each. Each pineapple could be cut into 12 pineapple rings. He sold 4 pineapple rings for $5 each. How much profit did Jonah make?