Q: Darcie is 4 years old. She is 1/6 as old as her mother and her mother is 4/5 as old as her father. How old is her father?
A: Darcie's mother is 4 * 6 = 24 years old. Darcie's father is 24 / 4 * 5 = 30 years old. The answer is 30.

Q: A father is buying sand to fill his son's new sandbox, but he is worried that the sand will be too heavy for his car. The sandbox is square, with each side being 40 inches long. If a 30-pound bag of sand is enough to fill 80 square inches of the sandbox to an adequate depth, how many pounds of sand are needed to fill the box completely?
A: The sandbox has an area of 40 * 40 = 1600 square inches. To fill this area, 1600 / 80 = 20 bags of sand are needed. Then, the weight of these bags is 20 * 30 = 600 pounds. The answer is 600.

Q: There are 14 kindergartners and 24 first graders and some second graders in Ms. Watson's class. Overall Ms. Watson has 42 students. How many second graders are in Ms. Watson’s class?
A:
There are 14 + 24 = 38 kindergartners and first graders in Ms. Watson’s class. There are 42 - 38 = 4 second graders in Ms. Watson’s class. The answer is 4.