Determine monthly gas expense face in 30 miles in the city and 75 miles on the highway with an average weight of gas today $2.35 MY CARS MPG IS 16 IN THE CITY AND 20 ON THE HIGHWAY

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

40 minutes

step-by-step explanation:

add the time and multiply by 2