It's the shortest IQ test in the world, comprising just three questions, but fewer than one in five people get it right.
1. A bat and a ball cost $1.10 in total. The bat costs $1 more than the ball. How much does the ball cost?
2. If it takes five machines five minutes to make five widgets, how long would it take 100 machines to make 100 widgets?
3. In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of the lake?
These are the three most common answers that people guess - but they are actually incorrect.
1. 10 cents
2. 100 minutes
3. 24 days
The correct answers are:
1. 5 cents
2. 5 minutes
3. 47 days