Monday 18 December 2023

Yesterday I Posted A Puzzle,

so I thought we would start the week with another one,


photograph Bournemouth Echo, the Cognitive Reflection Test was originally part of a research paper published in 2005 by MIT Professor Shane Frederick, and has recently resurfaced online with many people giving it a go, as part of his research, professor Frederick had more than 3,000 participants from a range of educational backgrounds complete the test, but even those attending top American universities such as Yale and Harvard struggled to work out all the answers, so what were the questions that beat so many students? Time allowed 1 minute for each question, here they are:

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

What are the answers? scroll down to see if you are correct,


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these are the three most common answers that people gave, 

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

and each one is wrong! The correct answers are:

1. Five cents
2. Five minutes
3. 47 days

to understand why if you did not answer the questions correctly have a look here.


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