Are You Smart Enough To Conquer The World’s Shortest IQ Test?

This should sort the smart guys from the dumb-dumbs.

How smart are you?

Do you know how smart you really are? Now could be the perfect time to find out and, best of all, you’ll only need to answer three questions to find out.

Sounds easy, right? Well, wait until you see the questions. The internet is littered with any number of IQ tests claiming to offer a clear assessment of your mental capabilities.

But rather than waste time filling out some 20-question test that will probably take a good few hours to complete, why not give the Cognitive Reflection Test a go.

Dubbed the world’s shortest IQ test, the CRT consists of just three questions and is designed to assess your ability to solve a trio of relatively straightforward problems that are actually way harder than they might initially appear.

The idea is that the quicker you can solve these three tests, the more intelligent you apparently are.

Here are the three questions followed by the three answers – no cheating at the back!

1. A bat and a ball cost £1.10 in total. The bat costs £1.00 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?

Now, if you guessed any of the following…

1. 10 pence
2. 100 minutes
3. 24 days

…you would be wrong.

Here are the correct answers, plus the working behind them:

1. 0.05 pence
If the ball costs X, and the bat costs £1 more, then it will be X+£1
So, Bat+ball=X + (X+1) =1.1
And that means 2X+1=1.1, and 2X=0.1
Making X= 0.05

2. 5 minutes
Five machines make five widgets in five minutes; so one machine will make one widget in five minutes too, meaning it would take 100 machines five minutes.

3. 47 Days
The patch doubles in size each day going forward, but also halves in size going backwards. Therefore, on day 47, the lake is half full.

Did you get all three right? No one at loaded did. Hardly a shock though, is it?

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