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There are eight bags of rice, which look alike. Seven of those bags have equal weights and one bag is slightly heavier. The weighing balance is of unlimited capacity. Using this balance, the minimum number of weighings required to identify the heavier bag is
  • a)
    2
  • b)
    3
  • c)
    4
  • d)
    8
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
There are eight bags of rice, which look alike. Seven of those bags h...
Keep two bags aside and consider two lots of three bags each and weigh them.
Case - I:
Unequal weighing results in identifying that the odd bag is in those six bags. Then, we will be left with three bags in which one is the odd bag. Then, keeping one bag aside and considering two lots of one bag each and weighing them will give us the final answer. So, this involves two stages of weighing.
Case - II:
Unequal weighing results in identifying that the odd bag is in those two bags, which are kept aside. Then, we will proceed with weighing those two bags and to get the final answer. So, this involves two stages of weighing only.
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