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.
Let's think: 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.

At the gym, every day, there are 300 towels laid out for guest use. Each guest is given 1 towel during their visit. The gym is open from 10:00 a.m. to 2:00 p.m. In the first hour, 50 guests enter the gym. In the second hour, 20% more guests enter than during the first hour. In the third hour, 25% more guests enter than in the second hour. In the fourth hour, one third more guests enter than in the third hour. In total, how many towels do they need to wash that evening?
Let's think: In the second hour, the number of towels given out is 50 x 1.20 = 60. In the third hour, the number of towels given out is 60 x 1.25 = 75. In the fourth hour, one - third of the guests of the third hour is 75 / 3 = 25. In the fourth hour, the number of towels given out is 75 + 25 = 100. In total, including the first hour guests, they need to wash this many towels: 50 + 60 + 75 + 100 = 285.. The answer is: 285.

Mark and Peter dug ponds in their backyards. Mark’s pond is 4 feet deeper than 3 times Peter’s pond. If Mark’s pond is 19 feet deep, what is the depth of Peter’s pond?
Let's think: Let’s use p for the number of feet in Mark’s pond. 3 * p + 4 = 19. 3 * p = 19 - 4 = 15. 3p = 15. p = 5.. The answer is: 5.

Juanita goes through 1 bottle of sunscreen a month. She likes to stock up for the entire year when a certain website offers 30% off her entire purchase. If each bottle is $30.00 how much will all of the sunscreen cost after the discount?
Let's think:
She goes through 1 bottle a month and she likes to stock up for the entire year, which is 12 months so she needs 1 * 12 = 12 bottles. Each bottle is $30.00 and she needs 12 bottles so they will cost 30 * 12 = $360.00. The website offers a 30% discount off of her $360.00 purchase so the discount will be .30 * 360 = $108.00. Her sunscreen costs $360.00 and her discount is 108.00 making her purchase total 360 - 108 = $252.00.. The answer is: 252.