We have a question: Ivan buys 48 apples to make 24 full-size pies. He ends up not using as many as he thought because he decides to make mini pies instead of full-size ones, which only use 1/2 an apple each. If Ivan bakes 24 mini pies, how many apples does he have leftover?
And an answer: 36
So how you got the answer?
Ivan wants to bake 24 pies which use 1 / 2 an apple each, 24 pies x 1 / 2 apple each = 12 apples. Ivan uses 12 of his 48 apples, 48 - 12 = 36 apples. Ivan has 36 apples leftover.

We have a question: Kohen has a business selling apples. Once a week, he orders 10 boxes of apples to add to his stock. If each box has 300 apples and he sells 3/4 of his stock in a certain week, what total number of apples is not sold?
And an answer: 750
So how you got the answer?
In a week, he orders 10 * 300 = 3000 apples. When 3 / 4 of the stock is sold, the total amount of apples sold becomes 3 / 4 * 3000 = 2250 apples. The amount of apples remaining is 3000 - 2250 = 750 apples.

We have a question: John worked 8 hours a day every day from the 3rd to the 8th, including the 3rd and not including the 8th. How many hours did he work?
And an answer: 40
So how you got the answer?
He worked for 8 - 3 = 5 days. So he worked for 5 * 8 = 40 hours.