Answer:
5"
Explanation:
You are copying a square of side 20 inches into a smaller version of it that is exactly 25% of the original size.
Notice that 25% can be written in fraction form as:
![(25)/(100) = (1)/(4)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ajn5vt8nj93a8e0kyfluuays768bz4ib0k.png)
This gives us a clue about how to reduce the original dimension: "multiply it by
, which is the same as divide it by 4:
![20](https://img.qammunity.org/2020/formulas/mathematics/middle-school/pwa3dyxja8n7lkekboe87e8v5n7vslu1c9.png)