back to school: some simple equations

think of a number, any positive whole number.
(you can also open your desktop calculator while you’re thinking.)

now multiply that number by 3.

now multiply the resulting number by itself.

add the digits repeatedly until you have a single digit.
(for example: 5432 becomes 14, which becomes 5)

place a “1” in front of the digit you found.
place a “2” in front of the same digit.
multiply these two numbers together, please.
(for example: the digit 5 becomes 15 x 25)

then multiply the resulting number by 5.

now multiply each digit of this number together.

you probably came up with something like 350, right?
as in 350ppm