mathtest.com

This is a DOS virus forces the user to answer a math question before you can use the program.

When you open mathtest.com, it will ask you 100 bytes long, so it won't work.

This only occurs during every wednesday, time between nine.

When you everytime open any DOS programs, you can only open a program when you answer correctly, if you get a wrong answer, you can't open it.

Use your calculator to get the answer!