This keno system is known as a reduced system. For this system to work you take more numbers and then reduce them through mathematics to come up with your target keno number. It doesn't matter whether your keno number is a spot 1 or 15.
Here is how you would use the reduced keno system. First, choose 6 numbers between 1 and 80. Place these numbers at the top of your keno chart. Now take those same numbers and place them in the light colored boxes vertically. Now, transfer the numbers to the keno entry forms. You will have 3 entry forms and each will contain 4 numbers.
Your total cost using this system will be $3. Each winning ticket will be around $119. If all 3 of your tickets win you will end up with $357.
This was a simple example of a keno system, hopefully it will help you out on your quest to win big and have fun doing it.