Answer this question:There are 15 cats in a shelter. One-third were adopted, and were replaced with twice the amount that were adopted. Later on, twice as many dogs showed up as there are cats. How many total animals are there in the shelter?
15 / 3 = 5 cats were adopted out of 15. There were 15 - 5 = 10 cats left. 5 * 2 = 10 more cats were added. This makes 10 + 10 = 20 cats in the shelter. 20 * 2 = 40 dogs came into the shelter. There are now 20 + 40 = 60 animals in the shelter.
The answer is 60.

Answer this question:Alex has not washed his clothes for a month; 18 shirts, 12 pants, 17 sweaters, and 13 jeans are waiting to be washed. Alex's washing machine can wash a maximum of 15 items per cycle. Each cycle takes 45 minutes. How many hours will it take the washing machine to wash all the clothes?
Alex will wash 18 + 12 + 17 + 13 = 60 items. With 20 items per wash cycle, Alex will wash the clothes in 60 / 15 = 4 cycles. With 45 minutes per cycle, the washing machine will take 45 * 4 = 180 minutes to wash the clothes. As 1 hour has 60 minutes, the washing machine will take 180 / 60 = 3 hours to wash the clothes.
The answer is 3.

Answer this question:Owen bred 21 turtles, and Johanna has 5 fewer turtles than Owen. After 1 month, Owen has twice as many turtles as before and Johanna loses half of her turtles and donates the rest to Owen. How many turtles did Owen have?
Johanna had 21 turtles - 5 turtles = 16 turtles. After 1 month, Owen was left with 21 turtles * 2 = 42 turtles. After 1 month, Johanna was left with 16 turtles / 2 = 8 turtles. After Johanna's donation, Owen was left with 42 turtles + 8 turtles = 50 turtles.
The answer is 50.

Answer this question:Deborah has four letters to mail. Standard postage is $1.08 per letter, with an additional charge for international mail. Deborah is mailing two letters internationally, and she is paying $4.60 to mail four letters. How many cents is the additional charge per letter for international shipping?
A dollar is 100 cents, so standard postage is 108 cents. Deborah’s four letters cost 108 * 4 = 432 cents for standard postage. She paid 460 - 432 = 28 cents for international shipping on two letters. Thus, the additional international shipping charge is 28 / 2 = 14 cents per letter.
The answer is 14.