[Question]: Billy and Margaret are competing with each other to see who can swim 10 laps the fastest. Billy swims his first 5 laps in 2 minutes, swims the next 3 laps in 4 minutes, swims the next lap in 1 minute, then swims his final lap. Margaret finishes swimming all of her laps in 10 minutes. Billy wins the competition by finishing his laps 30 seconds before Margaret does. In seconds, how long did it take Billy to swim his final lap?
[Answer]: Margaret finished all of her laps in 10 minutes * 60 seconds = 600 seconds. Billy's first 5 laps took 2 minutes * 60 seconds = 120 seconds. His next 3 laps took 4 minutes * 60 seconds = 240 seconds. His ninth lap took 1 minute * 60 seconds = 60 seconds. So his first 9 laps took 120 + 240 + 60 = 420 seconds. Billy finished swimming his laps before Margaret so all of his laps took a total of 600 30 = 570 seconds. This means that it took 570 seconds in total swimming time 420 seconds in time spent swimming the first 9 laps = 150 seconds for Billy to swim his final lap.
So the answer is 150.

[Question]: Danny has three picnics blankets. When they are unfolded they each have an area of 8 x 8. After he folds them up, their total area is 48 square feet. How many times did he fold them?
[Answer]: The total area of each blanket is 8 * 8 = 64. Their total area is 192 square feet because 3 x 64 = 192. He folded them 4 times because 192 / 48 = 4.
So the answer is 4.

[Question]: Simeon drinks 64 fluid ounces of filtered water every day. He used to drink this water in 8-ounce-servings. But now, he drinks his water in 16-ounce servings. How many fewer servings per day does it now take Simeon to drink his water than it used to?
[Answer]:
In 64 fluid ounces, there are 64 / 8 = 8 eight - ounce servings. Using 16 - ounce servings, Simeon now drinks 64 ounces in 64 / 16 = 4 servings. Thus, Simeon now drinks his water in 8 - 4 = 4 fewer servings per day.
So the answer is 4.