Question 314164
Let X be the size of the five pieces.
The sixth piece is Y.
1.{{{Y=2X+3}}}
2.{{{5X+Y=220}}}
Substitute eq. 1 into eq. 2,
{{{5X+Y=220}}}
{{{5X+2X+3=220}}}
{{{7X=217}}}
{{{X=31}}}
The five pieces are 31 feet and the sixth piece is 65 feet.