We have a question: Oprah has 3500 cars in her collection. If the average number of cars she gives away per year is 50, how many years will it take to reduce her car collection to 500?
And an answer: 60
So how you got the answer?
If Oprah wants to have 500 cars left, she will have to give away 3500 - 500 = 3000 cars. Since the average number of cars she gives away per year is 50, it will take her 3000 / 50 = 60 years to give away enough cars to have 500 left over.

We have a question: Ziggy is a club DJ. Typically, Ziggy gets 30 song requests every night. Half the songs requested are electropop. A third of that amount are requests for dance music. Five song requests are rock music, and song requests for oldies are three less in number than rock requests. Ziggy plays a DJ's choice song half the number of times he plays an oldie. Ziggy also sometimes gets rap song requests. Typically, how many rap songs does Ziggy get requested every night?
And an answer: 2
So how you got the answer?
Ziggy gets 30 / 2 = 15 electropop song requests every night. There are 15 / 3 = 5 dance song requests every night. There are 5 - 3 = 2 oldies requests every night. Ziggy plays DJ's choice 2 / 2 = 1 time every night. Thus, Ziggy gets 30 - 15 - 5 - 5 - 2 - 1 = 2 rap songs requested every night.

We have a question: Some students want to buy pencils from a stationery shop. The price of one pencil is 20 cents. Tolu wants 3 pencils, Robert wants 5 pencils and Melissa wants 2 pencils. How much (in dollars) will the students spend altogether at the stationery shop?
And an answer: 2
So how you got the answer?
The three students want a total of 3 + 2 + 5 = 10 pencils. Each pencil cost 20 cents so 10 pencils cost 20 * 10 = 200 cents. 100 cents make a dollar so 200 cents make 200 / 100 = 2 dollars.