If the train needs 300 gallons of fuel for a 100 mile trip, how much fuel does it need for a 750-mile trip?

Question

For a particular cargo train, the amount of fuel needed for a trip varies directly with the number of miles traveled.

Answer 1

Let x = the number of miles

Let y = the amount of fuel

y = kx

300 = k100

3 = k

y = 3x

y = 3(750)

y = 2250 gallons