Here are some problems based on finding the defective machine from given machines. All the machines are identical and produce indentical coins of 10 grams each.

Problem-1
You are given 10 machines. One machine is defective and it produces coins which are heavier or lighter than the other coins by 1 gram. You are given a balance on which the weight can be measured directly. You have to find the defective machine using the balance only once. You should also tell whether the defective coins are lighter or heavier.
Here is the solution.


Back to main page