13. Estimate the unknown value

Estimate the value of $y$ if the interior angle of the hexagon are $A = (2y +$13$)°$, $B = (y - 3)°$, $C = (y - 4)°$, $D = (2y - 3)°$, $E = y°$ and $F = (2y - 3)°$.

 

 

1. The value of $y$ is $i$.

 

2. The exterior angle of $B$ is $i$$°$.