John works at 2 different hospitals. At the first hospital, he sees 20 different patients each day. At the second hospital, he sees 20% more individual patients a day. He works 5 days a week. How many patients does he treat a year if he works 50 weeks a year? Give the rationale and then the answer.
Let's think step by step. He treats 20 * .2 = 4 extra patients. So he treats 20 + 4 = 24 patients at the second hospital. So he treats 20 + 24 = 44 patients a day. That means he treats 44 * 5 = 220 patients a week. So he treats 220 * 50 = 11,000 patients a year.. The answer is: 11000.

A magician has a top hat with 20 red marbles and a top hat with 30 blue marbles. If he takes away 3 red marbles and four times as many blue marbles as red marbles (without looking), how many marbles in total does he have left? Give the rationale and then the answer.
Let's think step by step. He had 20 red marbles and took away 3 leaving 20 - 3 = 17 red marbles. He took 4 times as many blue marbles as red marbles which is 4 * 3 = 12 blue marbles. He took 12 blue marbles from 30 leaving 30 - 12 = 18 blue marbles. He now has 17 + 18 = 35 marbles left.. The answer is: 35.

There are twice as many centipedes as humans on a certain island and half as many sheep as humans. How many sheep and humans in total are on the island if the number of centipedes is 100? Give the rationale and then the answer.
Let's think step by step. The number of humans on the island is 100 / 2 = 50. There are 1 / 2 * 50 = 25 sheep on the island. The total number of sheep and humans is 25 + 50 = 75.. The answer is: 75.