He needs to earn $150 more dollars because 500 - 200 - 150 = 150. He needs to sell 20 games because 150 / 7.5 = 20.
The answer: 20
Reverse engineering the question: Percy wants to save up for a new PlayStation, which costs $500. He gets $200 on his birthday and $150 at Christmas. To make the rest of the money, he's going to sell his old PlayStation games for $7.5 each. How many games does he need to sell to reach his goal?


Reasoning and answer: The mother is 41 years old now, so 5 years ago she was 41 - 5 = 36 years old. At that time the daughter's age was half hers so the daughter was 36 / 2 = 18 years old. Now (5 years after that time) the daughter is 18 + 5 = 23 years old. In 3 years, the daughter will be 23 + 3 = 26 years old.
The answer: 26
What was the question?
Question: 5 years ago, a mother was twice as old as her daughter. If the mother is 41 years old now, how old will the daughter be in 3 years?


The 2 skirts cost $13 x 2 = $26. The 3 blouses cost $6 x 3 = $18. The total cost for 2 skirts and 3 blouses is $26 + $18 = $44. Jane received $100 - $44 = $56 change.
The answer: 56
Reverse engineering the question: Jane bought 2 skirts for $13 each. She also bought 3 blouses for $6 each. She paid the cashier $100. How much change did she receive?


Reasoning and answer: He gets 500 * .8 = $400 off the cost of lenses. That means the lenses cost 500 - 400 = $100. The frames cost 200 - 50 = $150. So he pays 100 + 150 = $250.
The answer: 250
What was the question?
Question: James needs to get a new pair of glasses. His frames cost $200 and the lenses cost $500. Insurance will cover 80% of the cost of lenses and he has a $50 off coupon for frames. How much does everything cost?


Andrew has 6 * 3 = 18 shirts. So, Steven has 4 * 18 = 72 shirts.
The answer: 72
Reverse engineering the question: Steven has 4 times as many shirts as Andrew. Andrew has 6 times as many shirts as Brian. If Brian has 3 shirts, how many does Steven have?


If he had 200 fish and sells 50, he is left with 200 - 50 = 150 fish. If a third of them get spoiled 1 / 3 * 150 = 50 fish get spoiled. The remaining number of fish is now 150 - 50 = 100. He then gets 200 more to make 100 + 200 = 300 fish.
The answer: 300
Reverse engineering the question:
Steve owns a lake shop that sells fish. He has a stock of 200 fish. He sells 50 fish and because his refrigerators stop working a third of the remaining fish become spoiled. A new stock of 200 more fish arrives. How many fish does he have in stock now?