Q: Sandy's goal is to drink 3 liters of water in a day. She drinks 500 milliliters of water every after 2 hours. After how many hours will she be able to drink a total of 3 liters of water?
A: Since there are 1000 milliliters in 1 liter, then 3 liters is equal to 3 x 1000 = 3000 milliliters. She needs to drink 3000 / 500 = 6 sets of 500 milliliters of water. So, she will be able to drink a total of 3 liters after 6 sets x every 2 hours = 12 hours. The answer is 12.

Q: Purple Valley has one-quarter as many skirts as Seafoam Valley, and Seafoam Valley has two-thirds as many skirts as Azure Valley. If Azure Valley has 60 skirts, how many skirts does Purple Valley have?
A: Seafoam Valley has 2 / 3 as many skirts as Azure Valley, or (2 * 60) / 3 = 120 / 3 = 40 skirts. Purple Valley has 1 / 4 as many skirts as Seafoam Valley, or 40 / 4 = 10 skirts. The answer is 10.

Q: Lucca bought 200 pieces of bread. Lucca ate 1/4 of the pieces of bread in one day, and 2/5 of the remaining pieces the next day. If he ate half of the remaining pieces on the third day, calculate how many pieces of bread are remaining.
A:
On the first day, Lucca ate 1 / 4 * 200 = 50 pieces. The number of pieces remaining after the first day is 200 - 50 = 150. On the second day, Lucca ate 2 / 5 * 150 = 60 pieces of bread. The pieces of bread that remained after the second day is 150 - 60 = 90. If Lucca ate half of the remaining pieces of bread on the third day, he ate 1 / 2 * 90 = 45 pieces. The pieces of bread that are remaining after the third day are 90 - 45 = 45. The answer is 45.