Respuesta :
Equivalent fractions are the fractions which have the same value even through they look different.
Number of Yard used by Mr. Barber=[tex] \frac{7}{9} [/tex]
For fixing switch he needs wire =[tex] \frac{1}{3} [/tex]
Common denominator = 9
So [tex] \frac{1}{3} [/tex] = [tex] \frac{1}{3}\times \frac{3}{3} [/tex] = \frac{3}{9}
[tex] \frac{1}{3} and \frac{3}{9} are equivalent fractions.
So equivalent fraction with common denominator is \frac{3}{9}