There are 15 + 10 = 25 students in the class. 375 books were divided equally among them for a total of 375 / 25 = 15 books each. 15 girls will get a total of 15 * 15 = 225 books.
The answer: 225
Reverse engineering the question: There are 15 girls and 10 boys in Ms. Smith's class. She divided 375 books equally among them. How many books did all the girls get combined?


Reasoning and answer: So for all even - numbered floors (2, 4, 6, 8, 10), it takes 5 * 15 = 75 seconds. And for all odd - numbered floors (1, 3, 5, 7, 9) it takes 5 * 9 = 45 seconds. To climb all the floors, it takes 75 + 45 = 120 seconds. So it takes 120 / 60 = 2 minutes to get to the 10th floor.
The answer: 2
What was the question?
Question: A building has 10 floors. It takes 15 seconds to go up the stairs to the even-numbered floors and 9 seconds to go up to the odd-numbered floors. This includes getting to the first floor. How many minutes does it take to get to the 10th floor?


Joe can buy a game for $50 and sell it for $30, so he is losing $50 - $30 = $20 each month when he buys and sells a game. Joe starts out with $240 and he buys a game and sells a game he loses $20 per month, so it will take $240 / $20 = 12 months until he is out of money.
The answer: 12
Reverse engineering the question: Joe likes to play video games and he normally spends $50 a month on video games. Joe also sells his games for $30 each once he is done playing them. If he starts with $240, how many months can he buy games at $50 and sell them at $30 before he is out of money?


Reasoning and answer: Troy bakes 2 x 16 = 32 brownie pieces. 75% of one pan is 16 x 0.75 = 12 pieces. Guests eat 16 + 12 = 28 pieces. This many guests eat the brownies ala mode 28 - 4 = 24. This many scoops are eaten by the guests 24 x 2 = 48. The guests eat this many tubs 48 / 8 = 6 tubs.
The answer: 6
What was the question?
Question: Troy bakes 2 pans of brownies, cut into 16 pieces per pan. The guests eat all of 1 pan, and 75% of the 2nd pan. One tub of ice cream provides 8 scoops. If all but 4 of the guests eat the brownies ala mode (with 2 scoops of vanilla ice cream), how many tubs of ice cream did the guests eat?


The number of red roses Lorelei picks is 12 x 50% = 6 roses. The number of pink roses Lorelei picks is 18 x 50% = 9 roses. The number of yellow roses she picks is 20 x 25% = 5 roses. The number of orange roses she picks is 8 x 25% = 2 roses. The total number of roses in her vase is 6 + 9 + 5 + 2 = 22 roses.
The answer: 22
Reverse engineering the question: In the park, the first rose bush has 12 red flowers. The second rose bush has 18 pink flowers. The third rose bush has 20 yellow flowers. The fourth rose bush has 8 orange flowers. For her vase, Lorelei picks 50% of the red roses, 50% pink roses, 25% of the yellow roses, and 25% orange roses. How many roses are in her vase?


Steve has (1 / 2)(20) = 10 berries. Stacy has 2 + 3(10) = 32 berries.
The answer: 32
Reverse engineering the question:
Stacy has 2 more than triple as many berries as Steve. Steve has one half as many berries as Skylar. If Skylar has 20 berries, how many berries does Stacy have?