All I can tell you is that there is no outlier. Consider an outlier as a number that is far out, or odd in a series of numbers as such. For example, if you had {1,2,3,4,40}, 40 would be the outlier.
Answer: 41
Hope this helps ^W^
16 gal = 200 mi
X gal = 350
16/200 = X/350
Cross multiply divide
16(350) = 200(X) > 5600 = 200X
Solve for X
5600/28
X = 28