project folder needs to contain 2 files. You'll have a HTML page with a form that submits 3 numbers to a web server. A PHP page on that web server will add the numbers, divide by 3, then return the average of the numbers to the user.

The first file is a regular HTML page with a HTML form. The form needs 3 named text-boxes, a submit button, and a reset button. It should look something like this:

The exact format is not that important, but you need these form element at a minimum. Also, we will assume the user actually enters numbers in the boxes and do not at this point need to validate the data.

Your second file is a PHP page that will take the 3 numbers, add them together, then send the original 3 numbers and the average of the numbers back to the user along with a little text explaining what is what. The output to your user can be set up any way you want, but there should be a sentence that looks very much like this on the return trip.

for example

The average of 4, 5, and 6 is 5.

Program to Return the Average of 3 numbers Enter 1st number. Enter 2ed number. Enter 3rd number Submit Reset