Equivalent fractions are the fractions which have the same value even through they look different.
Number of Yard used by Mr. Barber=

For fixing switch he needs wire =

Common denominator = 9
So
=
= \frac{3}{9}
[tex] \frac{1}{3} and \frac{3}{9} are equivalent fractions.
So equivalent fraction with common denominator is \frac{3}{9}