You would add the fabric price, the craft glue and paper price. then you subtract your total from the $16.95.
17+7 =25
1/5 = 0.20
3/4= 0.75
25 + 0.20 + 0.75
=25 + 0.95
= 25.95
I hope this helped a bit!:)
The answer would be

There are three cups of water to 2 cups of rice.
4x - 3y = 51, when x = 15
Plug in 15 for x.
4(15) - 3y = 51
Simplify.
60 - 3y = 51
Subtract 60 from both sides.
-3y = 51 - 60
Simplify.
-3y = -9
Divide both sides by -3.
y = -9/-3
Simplify.
y = 3
~Hope I helped!~