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: 1500
Step-by-step reasoning process: 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.


Q: Aron spends 30 minutes/day three times a week vacuuming and 20 minutes/day 2 days a week dusting. How much time does he spend cleaning total each week?
A: 130
Step-by-step reasoning process: First find the total time Aron spends vacuuming: 30 minutes / day * 3 days / week = 90 minutes / week. Then find the total time Aron spends dusting: 20 minutes / day * 2 days / week = 40 minutes / week. Then add those two times to find Aron's total cleaning time per week: 90 minutes / week + 40 minutes / week = 130 minutes / week.


Q: Annie goes to school. Today is her birthday, so Annie decided to buy some sweets for her colleagues. Every classmate got 2 candies. In the end, Annie got left with 12 candies. If there are 35 people in Annie's class in total, how much did Annie spend on candies, if one candy costs $0.1?
A: 8
Step-by-step reasoning process: There are 35 people in Annie's class, which means, she has 35 - 1 = 34 classmates. Every classmate got 2 candies, so in total Annie gave out 34 * 2 = 68 candies. In the beginning she had 68 + 12 = 80 candies. One candy costs $0.1, so Annie spend 80 * 0.1 = $8 on candies.


Q: A school has 15 classrooms. One-third of these classrooms have 30 desks in each classroom and the rest have 25 desks in each classroom. Only one student can sit at one desk. How many students can this school accommodate so that everyone has their own desk?
A: 400
Step-by-step reasoning process: One - third of the classrooms have 30 desks, so there are 1 / 3 * 15 = 5 classrooms like that. The rest, which means 15 - 5 = 10 classrooms, have 25 desks. One - third of the classrooms can fit 5 * 30 = 150 students. The rest can fit 10 * 25 = 250 students. So in total, the school can be filled with 150 + 250 = 400 students.