1. think of any number
2. Multiply that number by 9
3. Now add up all the digits of that number (eg: 123 would turn to 1 + 2 + 3 = 6)
4. You’d most likely skip this step, but if u still have more than one digit remaining, add them together until u have only one
5. Solve for x (4/16) x 80 - 18 = x
x² + the answer u got for step 3 (or 4) = average age group 👍