Answer:
yard
Explanation:
Length of string Mrs. Ruiz has =
yard
Mrs. Ruiz needs to hang 3 banners using the string.
Having known that each banner uses same length of string to be hung we can divide total length of sting into 3 equal parts.
So, we can divide
yard by 3 as
⇒

Changing the division sing to multiplication by taking reciprocal of divisor.
⇒

We can now multiply numerators and denominators.
⇒
yard
∴ Mrs. Ruiz must used
yard of string for each banner.