3 Question Cognitive Reflection Test

The Cognitive Reflection Test was created in 2005 by psychologist Shane Frederick. Here it has been adapted into a 90 second multiple choice quiz.
Quiz by overtired
Last updated: March 1, 2021
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First submittedSeptember 3, 2019
Times taken727
Average score66.7%
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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?
1 cent
5 cents
8 cents
10 cents
11 cents
15 cents
2. If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets?
20 seconds
1 minute
5 minutes
10 minutes
20 minutes
100 minutes
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?
2 days
12 days
24 days
29 days
36 days
47 days
Level 84
Sep 4, 2019
Nice test, but kind of short.
Level 85
Sep 4, 2019
Glad you liked it. Yes, I'd prefer it to be longer, but there were only these three questions in Frederick's original Cognitive Reflection Test and as that's the basis of the quiz I wouldn't want to add more. Short and sweet I guess :)