Can You Pass the World's Shortest IQ Test? Less Than 20 Per Cent of People Can

Developed in 2005 by Princeton psychologist Shane Frederick, the quiz assesses your ability to process information slowly and rationally, rather than jumping to quick conclusions.

Before you get started, we’ll give you a quick hint: the questions might not be as easy as they first seem. A 2005 study found that students attending some of the nation's most prestigious universities (including Harvard and Yale) failed to get all three of these questions correct; only 17 per cent received a perfect score.

Think you have what it takes to ace the world’s shorted IQ test? Give it a shot! Here are the three questions:

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?