Reasoning and answer: She spent $8 + $4 = $12 on books. She started with $20, so she has $20 - $12 = $8 left to spend on posters. Each poster costs $4, so she can buy $8 / $4 = 2 posters.
The answer: 2
What was the question?
Question: Shelby had $20 to take to the book fair. She bought one book for $8 and another for $4. She decided to buy as many $4 posters as she could with the money she had left. How many posters can she buy?


The first pair of weights weighs 3 lb each so all total they weigh 2 * 3 = 6 lbs. The second pair of weights weigh 5 lbs each so they weigh 2 * 5 = 10 lbs. The third pair of weights weigh 8 lbs each so they weigh 2 * 8 = 16lbs. All total, the entire system of weights weigh 6 + 10 + 16 = 32 lbs.
The answer: 32
Reverse engineering the question: Cilia wants to buy a multi-level dumbbell system. The first pair of dumbbells are 3 lb weights, the second pair is 5 lb weights and the third is 8 lb pounds. How much does the entire system weigh?


Reasoning and answer: If the total contribution was three times as much as Harry contributed, and Harry contributed $30, the total contribution was 3 * $30 = $90. Since Harry contributed $30, his three friends together contributed $90 - $30 = $60. Since the three friends were contributing an equal amount, each friend contributed $60 / 3 = $20.
The answer: 20
What was the question?
Question: Harry's birthday was three weeks after the closing of the school. His three friends decided to contribute an equal amount of money to throw him a party. Harry added $30 to the contribution, making the total contribution three times as much as Harry contributed. Calculate the total amount of money that each of Harry's friends contributed.


The rate of the loan is 15%, which means Mike needs to give the bank an additional 20000 * 15 / 100 = $3000. So the car will cost him 35000 + 3000 = $38000.
The answer: 38000
Reverse engineering the question: Mike wants to buy a new car. He has chosen a red car for $35000. To be able to pay this price, he needs to loan part of the money from the bank, at a rate of 15%. How much money in total will Mike need to pay for the car, if he has to take $20000 from the bank?


Reasoning and answer: 30% of Mars is made up of other elements because 100 - 50 - 20 = 30. Mars weighs 500 tons because 150 / .3 = 500. The moon weighs 250 tons because 500 / 2 = 250.
The answer: 250
What was the question?
Question: The moon is made of 50% iron, 20% carbon, and the remainder is other elements. Mars weighs twice as much as the moon, but has the exact same composition. If Mars is 150 tons of other elements, how many tons does the moon weigh?


Reasoning and answer: Santana has 1 + 1 + 2 = 4 brothers with birthdays in the second half of the year. She has 7 brothers - 4 brothers = 3 brothers with birthdays in the first half of the year. Altogether, she has to buy 4 + 7 = 11 presents in the second half of the year. Therefore, she has to buy 11 - 3 = 8 more presents in the second half of the year.
The answer: 8
What was the question?
Question:
Santana has 7 brothers. 3 of them have birthdays in March, 1 of them has a birthday in October, 1 has a birthday in November, and another 2 of them were born in December. If Santana always buys each of her brothers a birthday present and a Christmas present, how many more presents does she have to buy in the second half of the year than the first half of the year?