Let's see how strong your logical ability is.

进城

Let's see how strong your logical ability is.
This is a problem mentioned by Terence Tao, one of the most outstanding mathematicians of the contemporary era and a Fields Medal winner, in a reporter interview.
There are 12 coins, one of which is counterfeit.
The given condition is that the counterfeit one is lighter.
Use a balance scale to weigh three times to find this lighter coin.

进城

This problem is actually very simple.
You don't need to know mathematics, nor do you need to know how to calculate.
As long as you can count and have corresponding logical thinking ability.
You can figure out how to solve it in one minute.