In the reading room of a library, there are23 reading spots. Each reading spot consists of a round table with 9 chairs placed around it. There are some readers such that in each occupied reading spot there are different numbers of readers. If in all there are 36 readers, how many reading spots do not have even a single reader?
a) 8 b) None c) 16 d) 15

• as there are 23 spots so,the there are 23 tables and each table there are 9 chairs.the condition is:each table occupies different no. of people.and as there are 36 people so these people can be arranged in each table:1,2,3,4,5,6,7,8 in this way.that means 36=1+2+3+4+5+6+7+8.that means 8 tables are occupied.so.(23-8)=15 tables have no single readers..
• 13 years agoHelpfull: Yes(58) No(5)
• there are 23 reading spot and max limit to people sit on 1 spot is 9.
  then answer may be-
  1. 1+2+3+4+5+6+7+8=36 people
  remaining empty table=23-8=15 ans
  2.9+8+7+6+5+1=36 people can sit
  then rem. empty table=23-6=17 ans
• 13 years agoHelpfull: Yes(12) No(10)
• Hey my sincere advise to m4maths..please try to post the actual answer explanation when ur going to upload any questions.then only we are able to get clarification on any problem..because every one has their own views...so automatically it leads to the wrong way...
• 9 years agoHelpfull: Yes(8) No(0)
• n(n+1)/2=36
  tn we get n=8
  23-8=15
• 13 years agoHelpfull: Yes(5) No(6)
• but 36=9+8+7+6+3+2+1...here 7 tables r filled..remaining are 23-7=16
  hw to solv dis please any1 help
• 12 years agoHelpfull: Yes(5) No(5)