A car uses 15 gallons of gaz to travel 300 miles. How many gallons are needed for this car to travel a distance of 430 miles?

Expert Answers
justaguide eNotes educator| Certified Educator

The car needs 15 gallons of gasoline to travel 300 miles.

For 1 mile it needs 15/300 gallons.

If the car has to cover 430 miles the gallons of gasoline needed is 430*(15/300) = 21.5

The car needs 21.5 gallons to travel 430 miles.

giorgiana1976 | Student
To determine how many gallons are needed for the car to travel a distance of 430 miles, we'll have to use the rule of three.

15 gallons...........................300 miles

x gallons..............................430 miles

We'll cross multiply:

x*300 = 15*430

x = 15*430/300

x = 15*43/30

x  =43/2

x = 21.5 gallons

Therefore, the car needs 21.5 gallons to travel 430 miles.