[Question]On our last vacation, I bought 4 times as many tetras as Tim bought clowns. Tim bought twice as many clowns as Rick bought guppies. If Rick bought 30 guppies, how many animals did we buy on our last vacation?
[Answer]If Rick bought 30 guppies, Tim bought 2 clowns / guppy * 30 guppies = 60 clowns. The total number of tetras bought by you is 4 tetras / clown * 60 clowns = 240 tetras. In total, the three bought 240 tetras + 60 clowns + 30 guppies = 330 animals. The answer is 330.

[Question]Krista started raising chickens. She has 10 hens who lay eggs. She sells the eggs for $3 a dozen. In four weeks, she sold $120 worth of eggs. If she sold all the eggs her hens laid, how many eggs does each hen lay a week?
[Answer]At $3 a dozen, Krista sold $120 / $3 = 40 dozen eggs. If 10 hens laid 40 dozen eggs in 4 weeks, that means 40 dozen eggs / 10 hens = 4 dozen eggs were laid by each hen in four weeks. To find out how many eggs each hen laid in a week, 4 dozen eggs / 4 weeks = 1 dozen eggs each week. Since a dozen has 12 eggs, each hen lays 12 * 1 = 12 eggs each week. The answer is 12.

[Question]Harper has 15 rubber bands. His brother has 6 fewer rubber bands than he has. How many rubber bands do they have together?
[Answer]His brother has 15 rubber bands - 6 rubber bands = 9 rubber bands. They have 15 rubber bands + 9 rubber bands = 24 rubber bands together. The answer is 24.

[Question]Kimberly went hiking and took a 4-liter bottle full of water with her. The first time she drank from it, she consumed a quarter of the water in the bottle. Later on, she drank 2/3rd of the remaining water. How much water is left in the bottle (in liters)?
[Answer]
Her first drink consumed 1 / 4 * 4 = 1 liter of water. Thus there were 4 - 1 = 3 liters of water left in the bottle. Next, she drank 2 / 3 * 3 = 2 liters. Thus, there were 3 - 2 = 1 liters remaining. The answer is 1.