Question 891760
Proportion problem.


{{{475/g=25/1}}}, unit being MILE per GALLON,  letting g = how many gallons for this trip.


Now, g is known.


Let c = cost;
{{{3.59/1=c/g}}}, and the unit is DOLLARS per GALLON.
Solve for c.


This can be done also using a chain of ratios as factors.  This is usually what you want to do when you have more than just a simple proportion.


Start with the given distance.
{{{highlight(475*miles*(1/25)(gallon/mile)3.59(dollars/gallon))}}}.
Look how the ratios are arranged and how the units cancel to leave just dollars.