Question

In 80 coins one coin is counterfeit what is minimum number of weighing to find out counterfeit coin

Answer 1

Answer:

6 times

1st time :weigh 40 twice the one with count of a coin will be more

2nd time: take the 20 coins which had a higher rate and then divide them into 10 coins with them again the file of 10 coins having higher weight will be the one having counterfeit coin

3rd time : take the 10 leftover coins with heavier weight .distribute them 5 coins each and them weight them. the one heavier will have the counterfeit coin

6th time :weigh the 5 coins individually the one having different weight will be the counterfeit coin