Here’s the world’s shortest IQ test – how will you get on?
The Cognitive Reflection Test (CRT) is described as the world’s shortest IQ test because it’s just three questions. The quicker you do it, the more intelligent you are.
GO!
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?
No scrolling down ’til you’ve come up with your answers.
Done it?
Here’s what a lot of people guess.
1. 10 pence
2. 100 minutes
3. 24 days
WRONG!
Seriously.
Here are the correct answers, courtesy of the Independent.
1.
The ball would actually cost 0.05 pence
If the ball costs X, and the bat costs £1 more, then it will be:
X + £1
Therefore
Bat + ball = X + (X + 1) = 1.1
Therefore
2X + 1 = 1.1, and 2X = 0.1
X = 0.05
2.
It would take 5 minutes to make 100 widgets.
Five machines can make five widgets in minutes; therefore one machine will make one widget in five minutes too.
Therefore if we have 100 machines all making widgets, they can make 100 widgets in five minutes.
3.
It would take 47 days for the patch to cover half of the lake
If the patch doubles in size each day going forward, it would halve in size going backwards. So on day 47, the lake is half full.
Tell us how you get on and we’ll let you know how the so-called president does just as soon as he gets back to us.
I know some of you may think l'm tough and harsh but actually I'm a very compassionate person (with a very high IQ) with strong common sense
— Donald J. Trump (@realDonaldTrump) April 21, 2013
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