Joke Collection Website - Bulletin headlines - In the second grade of primary school, how many flags are inserted in a square with six sides and four corners?

In the second grade of primary school, how many flags are inserted in a square with six sides and four corners?

Solution:

Because: 6 sides on each side, except the red flag on the corner, 4 sides on each side,

So: Excluding four red flags, the number of red flags is 4*4= 16 (face).

So: the number of red flags in the square * * * is 16+4=20 (surface).

In other words, there are 20 red flags in the square.