What type of answers are those?
Scan the equations in math-way and look at the graph
Your answer is very close to being correct; however, the true answer is actually

without any parenthesis needed around the fraction. Notice how there is no (x) at the end.
9 c 10 b 11 b 12a 13 c 14 d 15 d 16c 17 a or c
18 b 19 d 20 is b
3 2/3 = 3.67
1/4=.25
3.67 divided by .25= 14.67
So 14 bows can be made out of 3 2/3 meters of ribbion