In the reading room of a library, they are 23 reading spots. Each reading spot consists of a round table with 9 chairs placed around it. There some readers such that in each occupaid reading spot there are diffirent number of readers. If in all there are 36 readers, how many reading spots do not have even a single reader?

Shail

• Sep 4th, 2011

The key here is realizing that the tables that aren't empty each have a DIFFERENT number of readers. There's only one way to do this. The very least number of people you could have at a table is just...

Rawjesh

 Profile Answers by Rawjesh Questions by Rawjesh

• Nov 21st, 2010

AS, There are some readers such that in each occupied reading spot there are
different numbers of readers. 1+2+3+4+5+6+7+8= 36 readers so, 8 spots have
different readers. remaining are 23-8= 15. 15 spots are empty.

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