A patient is receiving treatment through a saline drip which makes 20 drops per minute. If the treatment lasts 2 hours, and every 100 drops equal 5 ml of liquid, how many milliliters of treatment will the patient receive after the 2 hours have passed?
Let's think: The total of minutes the treatment will take is 2 hours x 60 minutes / hour = 120 minutes. After 120 minutes has passed the total amount of drops that the patient will receive is 20 drops / minute x 120 minutes = 2400 drops. Knowing the number of drops, we know that the patient has taken 2400 drops x 5 ml / 100 drops = 120 ml.. The answer is: 120.

In one day, Ella's dog eats 4 pounds of food for every one pound of food that Ella eats. How much food do Ella and her dog in 10 days if Ella eat 20 pounds of food each day?
Let's think: If Ella's dog eats 4 pounds of food for every one pound of food that Ella eats, when Ella eats 20 pounds of food in a day, Ella's dog eats 4 * 20 = 80 pounds of food. Together, in one day, Ella and her dog eats 80 + 20 = 100 pounds. In 10 days, Ella and her dog will eat 10 * 100 = 1000 pounds of food.. The answer is: 1000.

John takes 3 naps a week. Each nap is 2 hours long. In 70 days how many hours of naps does he take?
Let's think: There are 70 / 7 = 10 weeks in 70 days. So he takes 10 * 3 = 30 naps. That means he naps for 30 * 2 = 60 hours.. The answer is: 60.

John decides to trade in his stereo system. His old system cost 250 dollars and he got 80% of the value for it. He then buys a system that costs $600 that he gets a 25% discount on. How much money came out of his pocket?
Let's think:
He got 250 * .8 = $200. He gets a 600 * .25 = $150 discount on the second system. So it cost 600 - 150 = $450. So he was 450 - 200 = $250 out of pocket.. The answer is: 250.