Step-by-step explanation:
Juan wants each balloon string to be 6 feet long.
Number of balloons bought = 43
Length of string = 6 feet
Total length of string required = 43 x 6 = 258 feet
Given that
[tex]1foot=\frac{1}{3}yard[/tex]
[tex]\texttt{Total length of string required = }\frac{258}{3}=86yards[/tex]
86 yards of string is required