how to do the problem and for it to be explained

Answer:
[tex]\frac{20}{10}=2[/tex]
Step-by-step explanation:
To answer this question, it is important to realize that one grid has 100 squares. In addition to this, 20/10 is a ratio and may be rewritten as 2. 20/10=2*100 squares is equal to 200 squares. So shade two grids, completely. Because 2 grids have 200 squares.