Given
John had a roll containing of wrapping paper

First, he must cut off 5/6 foot because it was torn.
He wants to divide it into 11 pieces.
To proof
As given in question
John had a roll containing of wrapping paper

( solving the mixed fraction form)
First, though, he must cut off 5/6 foot
than we get

Taking the L.C.M of 3 and 6 is 6


=23.83 feet (approx)
He wants to divide it into 11 piece
length of the each piece

length of the each pieces be 2.16 feet ( approx)
Hence proved