Skip to content
HTQHow To Quant
← Problem Bank

Counterfeit Coins I

ReasoningMedium~15 min· Brain Teasers
Problem

The Problem

You have 10 machines producing coins. One machine produces counterfeit coins weighing 9 grams; the others produce genuine coins weighing 10 grams. You have a digital scale.

Using ONE weighing, identify the counterfeit machine.