Have you ever taken a traditional I.Q. test? If so, then you know that there's one major problem with them. To be blunt, most I.Q. tests take way too long to complete. Sure, you want to have an idea of how smart you are, but you also have things to do. And you're smart enough to know you might have better use of your time than taking a test.
Fortunately, there's one intelligence-measuring test that you can finish in just a couple of minutes. And that's because the entire test consists of just three questions. It's called the Cognitive Reflection Test.
The test was developed by psychologist Shane Frederick at Princeton. It won't give you an actual I.Q. score, but it will give you bragging rights if you can get them all right. However, for most people, they wound up missing at least one question.
Here's the second question of the test. If you're wondering what exactly is this widget that the machines are making, try not to think about it too much. Although we're not timing this, so take as much time as you need.
For question two did you say that 100 machines could make 100 widgets in 100 minutes? If so, then you grossly underestimated the speed of these widget-making machines. But don't worry, even a wizard could get that one wrong.
The actual answer to question two is that 100 machines could make 100 widgets...in those same five minutes. From the information provided, each machine can make a widget in five minutes. So if you have 100 machines, you don't need additional time to make those 100 widgets.
For question three, it wanted to know how long it would take for the lily pad patch to cover half the lake. A common answer to this question is 24 days, or half of the 48 needed to cover the full lake. However, this answer is incorrect.
The real answer to question three is 47 days. If it doubles inside every day, and it was covered on day 48, that means it was half that size the day before. There's a good chance Kermit got this question right, but he might have an unfair advantage.