May 2012
Beginner
272 pages
6h 8m
English
You are given a frequent buyer card for your local coffee shop. Each time you buy a cup of coffee, you get a stamp on your card. When the card is filled, you get a free cup of coffee. Here are two scenarios:
• Card A. The card has 10 boxes for the stamps, and all the boxes are blank when you get the card.
• Card B. The card has 12 boxes for the stamps, and the first two boxes are already stamped when you get the card.
Question: How long will it take you to get the card filled up? Will it take longer with Card A or with Card B? After all, you have to buy 10 cups of coffee in both scenarios in order to get the free coffee. So does it make a difference which card you use?
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