[Question]Tom paints a room that has 5 walls. Each wall is 2 meters by 3 meters. John can paint 1 square meter every 10 minutes. He has 10 hours to paint everything. How many hours does he have to spare?
[Answer]Each wall is 2 * 3 = 6 square meters. So each wall takes 6 * 10 = 60 minutes to paint. So it takes 60 / 60 = 1 hour to paint each wall. That means in total it takes 5 * 1 = 5 hours to paint. So he has 10 - 5 = 5 hour left after finishing painting. The answer is 5.
Q: June has $500 for buying school supplies for the new school year. She buys four maths books at $20 each, six more science books than maths books at $10 each, and twice as many art books as maths books at $20 each. If she also bought music books, how much money did she spend on music books?
A: The total cost of maths books is 4 * 20 = $80$. She bought six more science books than maths books which totals 6 + 4 = 10 books. If each science book cost her $10 she spent 10 * 10 = $100 on science books. There were twice as many art books as maths books which total 2 * 4 = 8. The total cost for art books is 8 * 20 = $160. The total amount that she used for maths, science, and art books is 160 + 100 + 80 = $340. The amount she spent on music books is 500 - 340 = $160. The answer is 160.
Question: The moon has a surface area that is 1/5 that of Earth. The surface area of the Earth is 200 square acres. The land on the moon is worth 6 times that of the land on the Earth. If the total value of all the land on the earth is 80 billion dollars, what is the total value in billions of all the land on the moon?
Answer: If the moon land had the same value as earth land it would be worth 16 billion because 80 / 5 = 16. The moon's total land value is 96 billion because 16 x 6 = 96. The answer is 96.
[Question]Reagan's school has a fish tank with a total of 280 fish of two types, koi fish and goldfish. Over the next 3 weeks, the school added 2 koi fish and 5 goldfish per day. If the tank had 200 goldfish at the end of the three weeks, what's the total number of koi fish in the tank after the three weeks?
[Answer]The total number of days in 3 weeks is 3 * 7 = 21 days. If 2 koi fish are added every day, the total after 21 days is 21 * 2 = 42 koi fish. if 5 goldfish are added every day, the total after 21 days is 5 * 21 = 105 goldfish. The total number of fish in the tank after 3 weeks is 280 + 42 + 105 = 427 fish. If there were a total of 200 goldfish in the tank after 3 weeks, then the number of koi in the tank is 427 - 200 = 227 koi fish. The answer is 227.
Q: Two trains left the station at the same time, but took different tracks to their destination. One took a track that was 200 miles long and it went 50 MPH. The other took the other track that was 240 miles long and it went 80 MPH. How much time did it take them on average? (Round to the nearest integer.)
A: The first train took 5 hours because 200 / 40 = 5. The second train took 3 hours because because 240 / 80 = 3. The total time was 8 hours because 5 + 3 = 8. The average time was 4 hours because 8 / 2 = 4. The answer is 4.
Question: Sam shared a sum of money between his three cousins Sandra, Amy and Ruth in the ratio 2:1:3 respectively. If Amy got $50, how much did Sandra get?
Answer:
Going by the ratio, for every 1 part that Amy gets, Sandra will get 2 parts. Since Amy got $50, Sandra will get 2 * $50 = $100. The answer is 100.