[Question]: Oliver had 135 stickers. He used 1/3 of his stickers, gave 2/5 of the remaining to his friend, and kept the remaining stickers. How many stickers did he keep?
[Answer]: Oliver used 1 / 3 x 135 = 45 stickers. So, there were 135 - 45 = 90 stickers remaining. His friend received 2 / 5 x 90 = 36 stickers. Therefore, Oliver kept 90 - 36 = 54 stickers.
So the answer is 54.

[Question]: Nancy takes 3 antacids per day when she eats Indian food, 2 antacids per day when she eats Mexican food, and 1 antacid per day otherwise. If Nancy eats Indian three times a week and Mexican twice a week, how many antacids does she take per month?
[Answer]: First find the total number of antacids Nancy takes after eating Indian food per week: 3 antacids / day * 3 days / week = 9 antacids / week. Then find the total number of antacids Nancy takes after eating Mexican food per week: 2 antacids / day * 2 days / week = 4 antacids / week. Then find the number of days she doesn't eat Indian food or Mexican food: 7 days / week - 3 days / week - 2 days / week = 2 days / week. Then find the total number of antacids Nancy takes per week: 9 antacids / week + 4 antacids / week + 2 antacids / week = 15 antacids / week. Then multiply her weekly antacid consumption by the number of weeks per month to find her monthly consumption: 15 antacids / week * 4 week / month = 60 antacids / month.
So the answer is 60.

[Question]: Jenny is planning her catering budget for her wedding. She's going to have 80 guests. 3 times as many guests want steak as chicken. If each steak entree costs $25 and each chicken entree costs $18, how much is the total catering budget?
[Answer]:
Let s be the number of guests who want steak and c be the number who want chicken. We know that s + c = 80 and s = 3c. Substituting the second equation into the first equation, we get 3c + c = 80. Combining like terms, we get 4c = 80. Dividing both sides by 4, we get c = 20. Then multiply the number of guests who want chicken by the cost of each chicken entree: 20 guests * $18 / guest = $360. Then triple the number of guests who want chicken to find the number who want steak: 20 guests * 3 = 60 guests. Then multiply the number of guests who want steak by the cost of each steak entree: 60 guests * $25 / guest = $1500. Then add the cost of the steak and chicken entrees to find the total cost: $1500 + $360 = $1860.
So the answer is 1860.