[Question]: Joe found a new series to watch with a final season that will premiere in 10 days. The series has 4 full seasons already aired; each season has 15 episodes. To catch up with the season premiere he has to watch all episodes. How many episodes per day does Joe have to watch?
[Answer]: The total number of episodes is 4 seasons x 15 episodes / season = 60 episodes. Joe has to watch per day 60 episodes ÷ 10 days = 6 episodes / day.
So the answer is 6.

[Question]: Under standard growth conditions, the bacterial strain, E.coli, has a doubling time of 20 minutes.  If 1 single bacterial cell is used to start a culture grown under standard growth conditions, how many bacterial cells will there be after the culture is grown for 4 hours?
[Answer]: 4 hours is 4 * 60 = 240 minutes. If the doubling time is 20 minutes, then after 240 minutes, the number of bacteria would have doubled 240 / 20 = 12 times. Thus, starting with only 1 bacterial cell, after 4 hours, there will be 1 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 = 4,096 bacterial cells.
So the answer is 4096.

[Question]: A liter of chlorine costs $10 and is now sold at 20% off. A box of soap that costs $16 is now sold at 25% off. How much will you save if you buy 3 liters of chlorine and 5 boxes of soap?
[Answer]:
For each liter of chlorine, I can save $10 x .20 = $2. For each box of soap, I can save $16 x .25 = $4. With the 3 liters of chlorine, I can save $2 x 3 = $6. With the 5 boxes of soap, I can save $4 x 5 = $20. Therefore, I can save a total of $6 + $20 = $26.
So the answer is 26.