Discussion:
Three Questions
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El Castor
2020-09-27 06:50:40 UTC
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The following questions were posed in a paper by an MIT researcher,
and can now be found in numerous corners of the Internet. Care to give
them a try? No fair looking up the answers -- they really aren't that
hard. (-8

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?
Josh Rosenbluth
2020-09-27 07:11:18 UTC
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Post by El Castor
The following questions were posed in a paper by an MIT researcher,
and can now be found in numerous corners of the Internet. Care to give
them a try? No fair looking up the answers -- they really aren't that
hard. (-8
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?
$0.05
Post by El Castor
2. If it takes five machines five minutes to make five widgets, how
long would it take 100 machines to make 100 widgets?
5 minutes
Post by El Castor
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?
47 days
El Castor
2020-09-27 18:56:40 UTC
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On Sun, 27 Sep 2020 00:11:18 -0700, Josh Rosenbluth
Post by Josh Rosenbluth
Post by El Castor
The following questions were posed in a paper by an MIT researcher,
and can now be found in numerous corners of the Internet. Care to give
them a try? No fair looking up the answers -- they really aren't that
hard. (-8
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?
$0.05
Post by El Castor
2. If it takes five machines five minutes to make five widgets, how
long would it take 100 machines to make 100 widgets?
5 minutes
Post by El Castor
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?
47 days
An interesting thing about this little quiz is that I believe that
those who get it right don't "feel" or "think" they got it right, they
"know", if you know what I mean. (-8

Here is how students who took the test at some universities scored, as
in answered all 3 correctly.

Massachusetts Institute of Technology 48%
Princeton University 26%
Carnegie Mellon University 25%
Harvard University 20%
University of Michigan: Ann Arbor 14%
University of Toledo 5%
https://pubs.aeaweb.org/doi/pdfplus/10.1257/089533005775196732

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