Q: In the jar, there are 7 blue marbles, 11 red marbles, and some yellow marbles. If the chance of randomly picking a yellow marble is 1/4, how many yellow marbles are there?
A: Let y be the number of yellow marbles. There are 11 + 7 + y = 18 + y total marbles. y / (18 + y) = 1 / 4. 4y = 18 + y. 3y = 18. y = 6. There are 6 yellow marbles. The answer is 6.

Q: Patsy is gearing up for this weekend's graduation. She needs to have 6 appetizers per each of her 30 guests. She's making 3 dozen deviled eggs, 2 dozen pigs in a blanket and 2 dozen kebabs. How many more dozen appetizers does she need to make?
A: She needs 6 appetizers per each of her 30 guests so she needs 6 * 30 = 180 appetizers. She's made 3 dozen deviled eggs, 2 dozen pigs in a blanket and 2 dozen kebabs so she's made 3 + 2 + 2 = 7 dozen appetizers. 7 dozen appetizers is 7 * 12 = 84 appetizers. She needs 180 appetizers and has made 84 so she needs 180 - 84 = 96 appetizers. 96 appetizers, in dozens, is 96 / 12 = 8 dozen more appetizers. The answer is 8.

Q: Oliver collects trading cards. He has twice as many Monster Club cards as Alien Baseball cards. His Battle Gremlins card collection is the largest at 48 cards, three times the size of his Alien Baseball card collection. How many Monster Club cards does Oliver have?
A:
Oliver's Alien Baseball card collection has 48 / 3 = 16 cards. Oliver has twice as many Monster Club cards, so he has 16 * 2 = 32 Monster Club cards. The answer is 32.