Final answer:
The expression (n - 20) can be written in word form as 'n decreased by 20'.
Step-by-step explanation:
The expression (n - 20) can be written in word form as 'n decreased by 20'. It represents the subtraction of 20 from the value of the variable n.
For example, if n is 25, 'n decreased by 20' would mean subtracting 20 from 25, resulting in a value of 5.