Jenny is older than Charlie by five years, while Charlie is older than Bobby by three years. How old will Charlie be when Jenny becomes twice as old as Bobby?
Let's think: Jenny is older than Charlie by 5 years who is older than Bobby by 3 years, so Jenny is older than Bobby by 5 + 3 = 8 years. Jenny will be twice as old as Bobby when he is 8 * 2 = 16 years old. Jenny is 5 years older than Charlie so when Jenny is 16, Charlie will be 16 - 5 = 11 years old.. The answer is: 11.

James prints out 2 books. They are each 600 pages long. He prints out double-sided and 4 pages per side. How many sheets of paper does he use?
Let's think: He printed 600 * 2 = 1200 pages. Each sheet of paper was 4 * 2 = 8 pages. So he used 1200 / 8 = 150 sheets of paper.. The answer is: 150.

Jill likes to do small jobs online. She makes $10 a day for her first month working online, and double that per day in her second month. Her third month she makes the same amount per day as the previous month, but only works every other day. How much did she make over three months, assuming each month is 30 days long?
Let's think: Since there are 30 days in a month and Jill makes $10 a day her first month, she makes 30 * 10 = 300 dollars her first month. She makes twice the amount of the previous month's $300 in her second month, so she makes 2 * 300 = 600 dollars her second month. She makes the same amount per day the third month, but only works half the number of days, so she makes 600 / 2 = 300 dollars a month her third month. In total, she makes 300 + 300 + 600 = 1,200 dollars.. The answer is: 1200.

Tim sleeps 6 hours per day for 5 days a week and 10 hours a day for the other 2. How much total sleep does he get?
Let's think:
He gets 6 * 5 = 30 hours of sleep on 5 days. He gets 10 * 2 = 20 hours the other days. So he got 30 + 20 = 50 hours.. The answer is: 50.