Test your deductive reasoning

By Gabe Atkinson In Quiz

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21st March, 2014

For ways to improve your deductive reasoning, read our free feature article System Sherlock: That thinking feeling.


1. You have nine pigs. You must construct exactly four pens, with each containing an odd number of pigs. How would you do it?

2. A special force-field lets only certain objects pass through. Daffodils and hammers are allowed, but roses and wrenches aren’t. What determines whether an item can enter?

3. A father is four times as old as his son. In twenty years, he’ll be twice as old. How old are they now?

4. There is a small cabin in a forest. Inside are two dead men. The trees around the cabin are burning, although the cabin is not. The men had not been fighting and possessed no weapons. How did they die?

5. A man is looking at a photograph. His friend asks who it is. The man replies, “Brothers and sisters, I have none. But that man’s father is my father’s son.” Who is in the photograph?


Answers below. Highlight with the cursor to reveal them.

1. Build three pens and put three pigs in each. Then build a fourth pen around the other three.

2. Only objects with consecutive repeated letters may pass.

3. The father is 40 and the son is 10.

4. The men were piloting a plane that crashed.

5. His son.

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