Q: Toby is in a juggling contest with a friend. The winner is whoever gets the most objects rotated around in 4 minutes. Toby has 5 baseballs and each one makes 80 rotations. His friend has 4 apples and each one makes 101 rotations. How many total rotations of objects are made by the winner?
A: Toby gets 400 full rotations because 5 x 80 = 400. His friend get 404 rotations because 4 x 101 = 404. The winner rotated 404 objects because 404 > 400. The answer is 404.

Q: Mia has 4 times as many shells as David. Ava has 20 more shells than Mia. Alice has half the number of shells Ava has. If David has 15 shells, what the total number of conch shells they all have?
A: If David has 15 shells, then Mia has 4 * 15 = 60 shells. Ava has 20 more shells than Mia, so that is 60 + 20 = 80 shells. Alice has 1 / 2 the number of shells Ava has, which is 1 / 2 * 80 = 40 shells. The total number of shells all of them have is 15 + 60 + 80 + 40 = 195 shells. The answer is 195.

Q: Samuel swept the porch and cleared nine-tenths of the dust particles from it. As he walked across the porch afterward, his shoes left 223 dust particles behind. How many dust particles were on the porch before Samuel swept if there were 331 after he walked across it?
A:
Before Samuel walked across the porch, there were 331 - 223 = 108 dust particles. Those 108 were 1 / 10 of the original amount, so there were 108 * 10 = 1080 dust particles on the porch before Samuel swept. The answer is 1080.