Answer:

Explanation:
To divided those ten blocks into 3 equal groups, we have to use mixed number, because otherwise, if we use decimal numbers, we won't be that accurate.
So, if we divide ten by 3, we will have 3 as the whole part, and 1/3 as the decimal part:

Basically, the model would have 3 groups of
, which all together gives 10 boxes.