In her first year, Tara's dad attended 20 * 0.9 = 18 games. Then, in her second year, Tara's dad attended 18 - 4 = 14 games.
The answer: 14
Reverse engineering the question: During her first year playing soccer, Tara's dad attended 90% of the games she played. In her second year playing soccer, Tara's dad attended 4 fewer games than he did in the previous year. If Tara played 20 games each year, how many games did Tara's dad attend in her second year playing soccer?


Reasoning and answer: The first five runners took a combined total of 5 * 8 = 40 hours to finish the race. The number of runners who finished the race 2 hours later after the first five is 8 - 5 = 3. The 3 runners who finished the race 2 hours later took a total of 8 + 2 = 10 hours to run the race. Together, the three runners who finished the race in 10 hours took a total of 10 * 3 = 30 hours. All eight runners took 30 + 40 = 70 hours altogether to finish the race.
The answer: 70
What was the question?
Question: In a race, there are eight runners. The first five runners finish the race in 8 hours, while the rest of the runners finish the race 2 hours later. Calculate the total time the eight runners took to finish the race.


Savannah has 12 gifts to give her friends and family and has already wrapped 3 gifts + 5 gifts = 8 gifts already wrapped with the first two rolls of paper. She started off with 12 gifts to wrap and has already wrapped 8, 12 - 8 = 4 gifts she wraps with the third roll of paper.
The answer: 4
Reverse engineering the question: Savannah is wrapping presents for her friends and family for Christmas. She has bought 3 rolls of wrapping paper to wrap 12 gifts. If it takes 1 roll to wrap 3 gifts and 1 roll to wrap 5 other gifts, if there is no wrapping paper leftover after Savannah wraps the rest of the gifts, how many gifts did she wrap with the third roll of paper?


Reasoning and answer: He will spend 5 x 2 = 10 hours if he takes route A. Meanwhile, he will spend 2 x 2 = 4 hours if he takes route B. Therefore, Joseph can save 10 - 4 = 6 hours if he takes route B both ways.
The answer: 6
What was the question?
Question: Joseph wants to go to Boston for a road trip. If he takes route A, it will take him 5 hours to arrive; but if he takes route B, it will only take him 2 hours to arrive at his destination. How much time will he save if he takes route B to Boston and back to his home?


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
Reverse engineering the 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?


The two heavy washes will use 20 * 2 = 40 gallons of water. The three regular washes will use 10 * 3 = 30 gallons of water. The light wash will use 2 * 1 = 2 gallons of water. The two bleached loads will use an extra 2 * 2 = 4 gallons of water. In all, 40 + 30 + 2 + 4 = 76 gallons of water will be needed.
The answer: 76
Reverse engineering the question:
A washing machine uses 20 gallons of water for a heavy wash, 10 gallons of water for a regular wash, and 2 gallons of water for a light wash per load of laundry. If bleach is used, there is an extra light wash cycle added to rinse the laundry thoroughly. There are two heavy washes, three regular washes, and one light wash to do. Two of the loads need to be bleached. How many gallons of water will be needed?