For 108 miles you need 6 galons
For 162 miles you need W galons
W = (162 x 6) : 108 = 9 galons
So, for 162 miles you need 9 galons
For 108 miles you need 6 galons
For Y miles you need 11 galons
Y= (108 x 11 ) : 6 = 198
So, for 198 miles you need 11 galons