“Either you run the day or the day runs you.” - Jim Rohn

Short and sweet take a shot at the world’s shortest IQ test

A beautiful lady writing or taking notes on a tablet.
Franklin Izuchukwu

3 questions separate you from being of average intelligence and full-blown brainbox – but are they as easy as they seem?

The Cognitive Reflection Test has been hailed as the world’s shortest IQ test because it features just three questions.

These three questions are much harder than they seem.

Each one is designed to assess your abilities to identify a simple problem that might actually be harder than it first appears.

Not only do boffins claim that getting the right answer is a sign of genius, but also the time frame in which you come up with your solution.

Take the world's shortest IQ test.

  1. A bat and a ball cost N1.10 in total. The bat costs N1.00 more than the ball. How much does the ball cost?
  2. If it takes 5 machines 5 minutes to make 5 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?

Hope you aren't as tired as she is?

Now you’ve had a crack at the questions. The chances are you answered 10kobo for question 1, 100 minutes for question 2 and 24 days for question 3.

If you did, you are wrong. 

Scroll down to see the correct answers to the test, and the workings behind each one.

Little girl doing homework

1. The ball would cost 0.05 kobo.

If the bat costs N1 more than the bat, you need to think outside the box.

While it might be easy to assume that the ball is 10kobo, that would make the bat N1.10 as it costs N1 MORE than the ball.

To keep the total at N1.10, the ball HAS to be 5k – and the bat worth N1.05.

2. It would take 5 minutes to make 100 widgets 

Five machines can make five widgets in five minutes.

It means that one machine will make a widget in five minutes, too.

Therefore, 100 machines, all making widgets can make 100 widgets in 5 minutes.

3. It would take 47 days for the patch to cover half of the lake

The patch us doubling in size each day it is going forward, so it would halve going backwards.

It means that on day 47, the day before it covered the whole lake, it would be halfway there.

Share With Friends