Five coaster vans are used to transport students for their field trip. Each van carries 28 students, 60 of which are boys. How many are girls?
Let's think: There are a total of 5 vans x 28 students = 140 students. If 60 are boys, then 140 - 60 = 80 of these students are girls.. The answer is: 80.

Janet has a business selling custom collars for dogs and cats. If it takes 18 inches of nylon to make a dog collar and 10 inches to make a cat collar, how much nylon does she need to make 9 dog collars and 3 cat collars?
Let's think: First find the total number of inches of nylon used for the dog collars: 18 inches / dog collar * 9 dog collars = 162 inches. Then find the total number of inches of nylon used for the cat collars: 10 inches / cat collar * 3 cat collars = 30 inches. Then add the nylon needed for the cat and dog collars to find the total amount needed: 162 inches + 30 inches = 192 inches.. The answer is: 192.

A luxury bag costs $3000. A reseller wants to get a 15% profit. How much should she sell the bag?
Let's think: The reseller wants to get $3000 x 15 / 100 = $450 profit. Thus, she needs to sell it for $3000 + $450 = $3450.. The answer is: 3450.

Mark is looking to buy a total of 12 pieces of fruit at the store. He has already chosen 3 apples. He has also selected a bunch of bananas containing 4 bananas. How many oranges does he need to pick out to have 12 total pieces of fruit?
Let's think:
He has 3 apples and 4 bananas, so he has 3 + 4 = 7 pieces of fruit. He needs to buy 12 fruit - 7 fruit = 5 oranges.. The answer is: 5.