, 13 October 2021
Difficulty: Extreme!
Terri wants the cars moved around – can you help her do it?
Terri runs a car showroom. It has 3 roads to park cars on, which all meet in the middle of the showroom. Terri can fit 3 cars on each road. If she tries to park a fourth, it blocks the intersection in the middle.
At the moment, there are 2 Audis on one road, 2 BMWs on the second, and 2 Citroëns on the third. Terri wants to move them all around, putting the Audis where the BMWs are, the BMWs where the Citroëns are, and the Citroëns where the Audis are.
Terri isn’t sure she can do it. Can you explain a way to move the cars to the correct location?
Scroll down or click for a hint, or the answer!
This activity is a lot easier if you make a model. You can draw the roads on a piece of paper and use toy cars or cut up pieces of paper as the cars!
There are lots of ways to solve the problem, but this method is quite fast:
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