How many boxes do we have?

How many boxes do we have?

This is a problem to solve mentally, without the help of paper and pencil or other means.

We have three boxes of equal size individual and separated from each other. Inside each box there are two other smaller ones and in each of these another four still smaller ones.

How many boxes are there in total?


We have 33 boxes in total:

3 large boxes
6 medium boxes
24 small boxes