There are 27 balls, of which 1 is heavier. given a balance how many times you need to weigh to find out the odd ball.

• first make 3 groups of 9 balls each...den weight 2 group using balance which tells u which group is having the heavier ball...den split dat group into 3 groups each containing 3 balls...den follow same procedure...in 3 times u get heavier ball
• 11 years agoHelpfull: Yes(19) No(2)
• 3 times
  27=3^3
  
  if there are 3^n balls, then we have to weigh n times to find the odd ball.
• 11 years agoHelpfull: Yes(9) No(3)
• 3 times
  
  9,9,9 weigh 2 groups
  if both equal 3rd one is heavier otherwise heavier one can be identified [1 time ]
  repeat 3,3,3 [2nd weighing] , now with the obtained 3 weigh two u can easily find the heavier [third weighing]
• 10 years agoHelpfull: Yes(6) No(2)
• 3 times;
• 11 years agoHelpfull: Yes(3) No(2)
• but in total you weighing 6 times(twice at each level to find the heavier group)
• 11 years agoHelpfull: Yes(2) No(6)
• 3^3=27
  SO ANS = 3
• 8 years agoHelpfull: Yes(1) No(0)
• answer : 3 times.
• 11 years agoHelpfull: Yes(0) No(2)
• 13
  27/2 = 12.5 to take the higher side we will consider 13times..
  
• 8 years agoHelpfull: Yes(0) No(4)