Q: Joseph has a refrigerator, a water heater in his house, and an electric oven that consumes power at different rates. The total amount of money that Joseph pays for the energy used by the refrigerator is three times the amount he pays for the power used by the water heater. If the electric oven uses power worth $500 in a month, twice what Joseph pays for the power the water heater uses, calculate the total amount he pays for the power used by these gadgets.
A: If the electric oven uses power worth $500 in a month, twice what Joseph pays for the power the water heater uses, Joseph pays 1 / 2 * $500 = $250 for power used by the water heater. The total amount of money that Joseph pays for the power used by the water heater and the electric oven is $250 + $500 = $750. The total amount of money that Joseph pays for the energy used by the refrigerator is three times the amount he pays for the power used by the water heater, a total of 3 * $250 = $750. For the three gadgets, Joseph pays $750 + $750 = $1500 for the power they use. The answer is 1500.

Q: From Sunday to Thursday, Prudence sleeps 6 hours a night. Friday and Saturday she sleeps for 9 hours a night. She also takes a 1-hour nap on Saturday and Sunday. How much sleep does she get in 4 weeks?
A: 5 nights a week she sleeps for 6 hours so she sleeps 5 * 6 = 30 hours. 2 nights a week she sleeps for 9 hours so she sleeps 2 * 9 = 18 hours. 2 days a week she naps for 1 hour so she sleeps 2 * 1 = 2 hours. Over 1 week she sleeps 30 + 18 + 2 = 50 hours. Over 4 weeks she sleeps 4 * 50 = 200 hours. The answer is 200.

Q: A farmer has three trucks to carry water to his farm. Each truck uses three tanks with a capacity of 150 liters of water. How many liters of water in total can the farmer carry in his trucks?
A:
1 truck uses 3 tanks of 150 liters, so a truck can carry 3 tanks per truck * 150 liters = 450 liters per truck. The total amount of water the 3 trucks carry is 3 trucks * 450 liters per truck = 1350 liters. The answer is 1350.