Let [tex] l [/tex] be the length of the I-476. We know that the 22 miles long portion is one sixth of the total. So, if we divide the total by six we get 22:
[tex] \dfrac{l}{6} = 22 [/tex]
Multiply both sides by 6:
[tex] l = 22\cdot 6 = 132[/tex]
