SOLUTION: During 60 mi of driving, Jenna averaged 15 mi/gal. She then drove 140 mi on an expressway and averaged 25 mi/gal for the entire 200 mi. Find the average fuel consumption on the exp

Question 587692: During 60 mi of driving, Jenna averaged 15 mi/gal. She then drove 140 mi on an expressway and averaged 25 mi/gal for the entire 200 mi. Find the average fuel consumption on the expressway.
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
Before getting on the highway Jenna drove 60 miles, while getting 15 miles per gallon. That means that the amount of gas she used for that part of the trip, in gallons, is
(60 miles)/(15 miles/gallon) = 4 gallons
For the entire trip, she travelled 200 miles, getting an average of 25 miles per gallon. That means that the amount of gas used for the entire trip, in gallons, is
(200 miles)/(25 miles/gallon) = 8 gallons
The portion of the trip where Jenna drove on the highway was 140 miles long and must have consumed
8 gallons � 4 gallons = 4 gallons of gas.
The average fuel consumption for that part of the trip is
140 miles/4 gallons = 35 miles/gallon.
I see no need to make this problem any more complicated than a fourth grader (or even a fifth grader) would understand.
RELATED QUESTIONS
1. a town's old street sweeper can clean the streets in 60 h. the old sweeper together... (answered by stanbon)

on a trip jennifer noticed that her car averaged 21 mi/gal of gas except for the days she (answered by ikleyn)

Andea's car averages 18.4 mi/gal in city driving and 25.8 mi/gal in highway driving. if... (answered by checkley77)

Hi! This is a problem from me test. I really need help. Thank you On a trip Jennifer... (answered by Sarah900)

Mrs paige drove 270 mi. Last week and used 6 gal. Of gas how many gal. Will she use if... (answered by vja_1994,MathTherapy,richwmiller)

Wilma drove at an average speed of 45 mi/h from her home in City A to visit her sister in (answered by ankor@dixie-net.com)

a car used 14 gal. of gas an traveled a total distance of 550 mi. the car's fuel... (answered by stanbon)

Wilma drove at an average speed of 40 mi/h from her home in City A to visit her sister... (answered by mananth)

Frank drove 100 mi. For the first 55 mi. he averaged 50 mph and for the last 45 mi he... (answered by stanbon,Deina)