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The principle of the following puzzle is very similar to that contained in "Think of a Number."

First of all a ring must be provided, after which you can request the company to put it upon some one's finger, adding at the same time that you will tell them who has it, and also upon which hand, and even upon which finger it shall have been placed.

The ring being deposited on a certain finger, you must then ask some one to make for you the necessary calculation.

Multiply the number of the person having the ring by 2; to that add 3. Multiply this by 5; then add 8 if the ring be on the right hand, or 9 if on the left. Then multiply by 10, and add the number of the finger (the thumb is 1); and, lastly, add 2.

Ask now for the result, from which subtract mentally 222, and the remainder will give the answer.

For instance, supposing the ring were put on the fourth person, on the left hand, and the first finger, remembering that the thumb counts 1.

The following is the kind of sum to be worked out:—