Solution to Riddle of the Week

Solution to Riddle of the Week: One Light and Three Switches

Difficulty level: Easy

By Jay Bennett

Have you figured out how to tell which switch controls the light? You can see the original question here.

SOLUTION

Flip switch number 1 and wait a few minutes. Flip switch number 1 back to its original position, and then immediately flip switch number 2.

Open the door. If the light is on, then switch number 2 controls it. If the light is off, then go and feel the bulb with your hand. If the bulb is hot, the switch number 1 controls it, and if the bulb is cold, then switch number 3, the one you did not touch, controls it.

Come back next week for another riddle!