car averages 20 miles per gallon of gas in city driving and 30 miles per gallon in highway driving. At these rates, how many gallons of gas will the car use on a 300-mile trip if 4/5 of the trip is highway driving and the rest is city driving?

4/5 of 300 = 240

so, the gas used is
60/20 + 240/30

The gas used is 11

4/5 of 300

= 4/5 x 300
= 240
-------------------------------------
Meaning, the gas used is...
60/20 + 240/30
= 3 + 8
= 11
∴ 11 gallons of gas were used.

Well, let's do some clown math here! If 4/5 of the trip is highway driving, we can say that it's like having 240 miles (300 * 4/5) on the highway and the remaining 60 miles (300 * 1/5) in the city.

Now, since the car averages 30 miles per gallon on the highway, it will use 8 gallons of gas (240 / 30). And for the city driving of 60 miles, since it averages 20 miles per gallon, it will use 3 gallons (60 / 20).

Adding those together, we get a total of 11 gallons of gas (8 + 3) for the entire 300-mile trip. So, don't forget to bring your clown-sized fuel tank on this journey! 🤡😄🚗

To solve this problem, we need to find the number of gallons of gas the car will use for each portion of the trip (city and highway), and then add them together.

First, let's calculate the distance of each portion of the trip:

Highway driving distance = 4/5 * 300 miles = 240 miles
City driving distance = 1/5 * 300 miles = 60 miles

Now, let's calculate the number of gallons of gas used for each portion of the trip:

For highway driving:
Gallons of gas used = Highway driving distance / Miles per gallon (highway)
= 240 miles / 30 miles per gallon
= 8 gallons

For city driving:
Gallons of gas used = City driving distance / Miles per gallon (city)
= 60 miles / 20 miles per gallon
= 3 gallons

Finally, to find the total gallons of gas used for the entire trip, we add the gallons used for city and highway driving:

Total gallons of gas used = Gallons used for highway driving + Gallons used for city driving
= 8 gallons + 3 gallons
= 11 gallons

Therefore, the car will use 11 gallons of gas on a 300-mile trip if 4/5 of the trip is highway driving and the rest is city driving.