Ella is driving her mother to her aunts house. she drives sixty miles per hour for the first hour, fifty miles per hour for the second hour, and fourth miles per hour for the third hour. how many miles did she drive in all?

150 Miles

Step-by-step explanation:

60 mph for one hour equals 60 miles so far, 50 mph for one hour is 60 +50 or  110 miles, and 40 mph for one hour equals 60+50+40=150 miles in total.

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: