Rica is left with 1 - 1 / 5 = 4 / 5 of her prize money which is equal to $300. Since 4 / 5 is worth $300, then 1 / 5 is worth $300 / 4 = $75. So, Rica got $75 x 5 = $375 from their prize money which is 3 / 8 of the total prize. Since 3 / 8 is equal to $375, then 1 / 8 is worth $375 / 3 = $125. So, the total prize money is $125 x 8 = $1000.
The answer: 1000
Reverse engineering the question: Rica's group won in a dance competition. She got 3/8 of the prize money. From Rica's prize money, she spent 1/5 of it and is now left with $300. How much was the prize money that her group won?

An hour has 60 minutes. If each call lasts an hour, the total amount of money charged is 60 * .05 = $3 for 1 customer. When she talks to 50 clients in a week, the total amount of money charged is 50 * 3 = $150. In a month of 4 weeks, the phone bill is 150 * 4 = $600.
The answer: 600
Reverse engineering the question: Ayla has a customer care job whose primary role is to hear complaints from customers and advise them on the best way to solve their problems. She talks with each customer for a limited amount of time, and each phone call is charged five cents per minute. If each call lasts 1 hour, what's the phone bill at the end of the month if she manages to talk to 50 customers a week?

The cat got a 15 / 60 = .25 hour head start. That means it ran 20 * .25 = 5 miles. The rabbit goes 25 - 20 = 5 mph faster than the cat. So it takes 5 / 5 = 1 hour for the rabbit to catch up.
The answer: 1
Reverse engineering the question: Tom's rabbit can run at 25 miles per hour. His cat can run 20 miles per hour. The cat gets a 15-minute head start. In hours, how long will it take for the rabbit to catch up?

The contribution of the students amounted to $5 x 20 = $100. So Miss Grayson's class had $100 + $50 = $150 in all. The cost of the field trip amounted to $7 x 20 = $140. Therefore, the class of Miss Grayson is left with $150 - $140 = $10.
The answer: 10
Reverse engineering the question:
Miss Grayson's class raised $50 for their field trip. Aside from that, each of her students contributed $5 each. There are 20 students in her class, and the cost of the trip is $7 for each student. After all the field trip costs were paid, how much is left in Miss Grayson's class fund?