Suppose there are 100 gates for going in and out,first dog open the 1st,2nd, 3rd upto 100, second dog changes the pattern of 2 ,4, 6...100, 3rd dog changes the earlier pattern of 3,6,9....100 and its continue upto 100th dog , in the end which gate is open...

• ans -100 as
  1st dog 1 2 3 4 5 ......100
  2nd dog 2 4 6 8........100
  3rd dog 3 6 9 12........100
  likely 5th dog 5 10 15 20....100
  therefore 100th dog opens the 100th gate only
  
  
• 10 years agoHelpfull: Yes(3) No(0)
• by seeing anyway all gates are opened
  at the end 100th gate will be opened
  so ans is 100
• 10 years agoHelpfull: Yes(1) No(0)
• 1st gate...
  first dog opens 1 2 3 ....100
  second and the rest of the dogs change the pattern of other gates but do not change first gate so it remains opened
• 10 years agoHelpfull: Yes(0) No(0)
• 100
  . .
  . last dog starts their pattern with 100
• 10 years agoHelpfull: Yes(0) No(0)
• 1 st dog open 1 2 3 4.....100
  2nd dog open 2 4 6 ...100
  3rd dog open 3 6 9.....100
  and finally 100th dog open 100 no. of gate
  
• 9 years agoHelpfull: Yes(0) No(0)