During 60 mi of city driving, Jenna averaged 15mi/gal. She then drove 140 mi on an expressway and avaeraged 25mi/gal for the entire 200 mi. Fuel consumption?

Question

I need to know avaerage fuel consumption on the expressway. I could not write the whole question in the bar 

Answer 1

Use units analysis:  mi/(mi/gal) = (mi)*(gal/mi) = gallons

 

(60 mi)/(15 mi/gal) + (140 mi)/(25 mi/gal) = _________ gallons