So I'm not understanding how I got the answers, it explains it above but I'm still not understanding. If anyone would break it down for me that'll be great!

(Example) So on #17, the numbers they gave you were 12,72.
You want to put it in fraction form, and fraction form is y/x.
The 1st number in the set of points (12) is always x, and the 2nd number (72) is always y.
12,72 in fraction form is 72/12.
Simplify by dividing 72 by 12, which is 6.
So the simplified fraction is 6/1.
You said 1/6, which is different from 6/1 because 6/1 is a whole number: 6. So basically it means 6 chairs for every table.
You pretty much did everything right, you just did it flipped.
Hope this helped a bit:)