As you can see, this time you have to figure out what numbers go on the
right and the bottom. To figure out the number on the right you just solve
the following:
top - left = right
In this case you would solve this problem:
20 - 9 = 11
This gives you the number on the right. To get the number on the bottom you
just multiply the number on the left by the number on the right and you got
it.
