Noah's method would always work because the inverse of 20% is 5.
Percentage can be described as a fraction out of an amount that is usually expressed as a number out of hundred. Percentages are represented with this sign - %.
The inverse of a number is determined by dividing 1 by that number.
1/ 20% = 1/0.2 = 5.
This makes dividing a number by 20% the same as dividing a number by 5.
To learn more about percentages, please check: https://brainly.com/question/92258