Answer:
2 1/4
Step-by-step explanation:
-5 1/4 + 7 1/2=
-5 1/4 + 7 2/4= 2 1/4
Let the total ribbon Zoe had was x feet.
Out of x feet, she used 3/8 part of it.
Hence, 
3/8 part of the original ribbon is equal to 9 feet.
Hence, we get

=> Multiply 8 on both sides.

Divide both sides by 3


Zoe had 24 feet of ribbon in starting... Answer
Her total bill is $186 because :
(3x39)+15+(2x27)