He got 20 - 8 = 12 gifts on his 13th birthday. So he got 20 + 12 = 32 total gifts.
The answer: 32
Reverse engineering the question: John received 20 gifts on his 12th birthday. He received 8 fewer gifts on his 13th birthday. How many total gifts did he receive between those two birthdays?
Reasoning and answer: Yvonne swims 10 laps in 5 minutes and her younger sister swims half as many laps in 5 minutes so she swims 10 / 2 = 5 laps in 5 minutes. Joel can swim 3 times the amount of his youngest sister's 5 laps so he can swim 3 * 5 = 15 laps in 5 minutes.
The answer: 15
What was the question?
Question: Yvonne swims 10 laps in 5 minutes. Her younger sister can swim half as many laps as Yvonne in the same time frame. Their brother Joel can swim three times the number of laps as the youngest sister. How many laps can Joel swim?
If Nataly has 3 times as much money as Raquel, she has 3 * $40 = $120. Tom has 1 / 4 as much money as Nataly, so he has 1 / 4 * $120 = $30. Combined, the three have $30 + $120 + $40 = $190.
The answer: 190
Reverse engineering the question: Tom has a quarter as much money as Nataly. Nataly has three times as much money as Raquel. How much money do Tom, Raquel, and Nataly have combined if Raquel has $40?
Reasoning and answer: First find the area of one side of a roof: 20 feet * 40 feet = 800 square feet. Then multiply that number by 2 to find the total area of both sides of the roof: 800 square feet / side * 2 sides = 1600 square feet. Then multiply that number by the number of roofs to find the total area of all the roofs: 1600 square feet / roof * 3 roofs = 4800 square feet. Then multiply the total area of the roofs by the number of shingles needed per square foot to find the total number of shingles needed: 4800 square feet * 8 singles / square foot = 38400 shingles.
The answer: 38400
What was the question?
Question: Jerry needs to shingle 3 roofs. Each roof is made of two slanted rectangular sides measuring 20 feet by 40 feet. If he needs 8 shingles to cover one square foot of roof, how many shingles does he need total?
If Jayden received 300 coins, 60 fewer than what Jason received, then Jason received 300 + 60 = 360. Altogether, the two boys received 360 + 300 = 660 coins.
The answer: 660
Reverse engineering the question: After working for Mrs. Jane, Jason was paid 60 more coins than Jayden. If Jayden received 300 coins, how many coins did Mrs. Jane give to the boys in total?
He sold 2 * 25 = 50 amulets. So he made 40 * 50 = $2000. The faire took 2000 * .1 = $200. So he kept 2000 - 200 = $1800. The amulets cost 50 * 30 = $1500 to make. So he had a profit of 1800 - 1500 = $300.
The answer: 300
Reverse engineering the question:
Dirk sells amulets at a Ren Faire. He sells for 2 days and each day he sells 25 amulets. Each amulet sells for 40 dollars and they cost him 30 dollars to make. If he has to give 10% of his revenue to the faire, how much profit did he make?