Cadets are marching in a parade. There are 5 cadets in a row. What is the rule which gives the number of cadets, given the number of rows? (Use n for the number of rows.)
We know that there are 5 cadets in 1 row. We do not know the number of rows which is a variable. Let's suppose that number of rows be n.
Therefore, number of cadets in n rows = 5n