[Question]: Matthew, Patrick and Alvin are eating dinner together. Matthew eats three times as many egg rolls as Patrick eats. Patrick eats half as many egg rolls as Alvin eats. If Alvin ate 4 egg rolls, how many did Matthew eat?
[Answer]: Patrick eats 1 / 2 of the 4 egg rolls that Alvin eats, 1 / 2 x 4 = 2 egg rolls. Matthew eats 3x as many egg rolls as Patrick eats, 3 x 2 = 6 egg rolls that Matthew eats.
So the answer is 6.

[Question]: Carla has 6 sunflowers and 8 dandelions. The sunflowers have 9 seeds per plant and the dandelions have 12 seeds per plant. What percentage of Carla's seeds come from the dandelions?
[Answer]: First calculate the number of seeds from the sunflowers by multiplying the number of sunflowers by the number of seeds per sunflower: 6 sunflowers * 9 seeds / sunflower = 54 seeds. Next calculate the number of seeds from the dandelions by multiplying the number of dandelions by the number of seeds per dandelion: 8 dandelions * 12 seeds / dandelion = 96 seeds. Now add the number of seeds from each group of plants to find the total number of seeds: 54 seeds + 96 seeds = 150 seeds. Now divide the number of dandelion seeds by the total number of seeds and multiply the answer by 100 to find the percentage of seeds that come from the dandelions: 96 seeds / 150 seeds * 100% = 64%.
So the answer is 64.

[Question]: Alicia has to buy some books for the new school year. She buys 2 math books, 3 art books, and 6 science books, for a total of $30. If both the math and science books cost $3 each, what was the cost of each art book?
[Answer]:
The total cost of maths books is 2 * 3 = 6 dollars. The total cost of science books is 6 * 3 = 18 dollars. The total cost for maths and science books is 6 + 18 = 24 dollars. The cost for art books is 30 - 24 = 6 dollars. Since he bought 3 art books, the cost for each art book will be 6 / 3 = 2 dollars.
So the answer is 2.