Reasoning and answer: Christina's age will be half of 80 in five years to come, meaning in five years, Christina's age will be 1 / 2 * 80 = 40 years. If in five years Christina will be 40, currently she is 40 - 5 = 35 years old. Oscar will be 3 / 5 times as old as Christina is now in 15 years, meaning he will be 3 / 5 * 35 = 21 years old in 15 years. Currently, Oscar is 21 - 15 = 6 years old.
The answer: 6
What was the question?
Question: Christina's age will be half of 80 years in five years to come. If Oscar will be 3/5 times as old as Christina is now in 15 years, calculate Oscar's age now.


In 2 years there are 365 * 2 = 730 days. So he has learned 730 * 10 = 7300 words. He knew 1 / .5 = 2 times that number of words before the book. So he knew 7300 * 2 = 14600 words before.
The answer: 14600
Reverse engineering the question: Tim buys a book of esoteric words. He learns 10 words from it a day. In 2 years the book has increased the number of words he knows by 50%. How many words did he know originally?


Reasoning and answer: He delivers 6 * 100 = 600 papers. On Sunday, he delivers an additional 100 - 10 + 30 = 120 papers. He delivers a total of 600 + 120 = 720 papers each week.
The answer: 720
What was the question?
Question: Kyle has a newspaper-delivery route. Every Monday through Saturday, he delivers the daily paper for the 100 houses on his route. On Sunday, 10 of his customers do not get the Sunday paper, but he delivers 30 papers to other houses that get the newspaper only on Sunday. How many papers does Kyle deliver each week?


Let's say the side of a square is s.To get the perimeter of a square, you add all the sides, which is s + s + s + s = 100. Therefore, 4s = 100. Therefore one side of the square is s = 100 / 4 = 25.
The answer: 25
Reverse engineering the question: While practising for his upcoming math exams, Hayes realised that the area of a circle he had just solved was equal to the perimeter of a square he had solved in the previous problem. If the area of the circle was 100, what's the length of one side of the square?


Reasoning and answer: There are 7 * 2 = 14 days in two weeks. So he played 14 * 4 = 56 hours. That means the total length of the game is 56 / .4 = 140 hours. So he has 140 - 56 = 84 hours to beat the game. So it will take him 84 / 7 = 12 days to beat the game.
The answer: 12
What was the question?
Question: John plays a game for 4 hours a day every day for 2 weeks. After all that time, he is only 40% done. He increased his playtime to 7 hours a day. How long until he finishes the game?


Reasoning and answer: If Chiquita is 5 feet tall, then Mr. Martinez is 5 + 2 = 7 feet tall. Together, their height is 7 + 5 = 12 feet.
The answer: 12
What was the question?
Question:
Mr. Martinez is two feet taller than his daughter, Chiquita. If Chiquita is 5 feet tall, calculate their combined height.