Boris is driving his motorhome. It uses 3 gallons of gas for every 21 miles he travels. Complete the table below showing the number of gallons used and the distance traveled. ​

4, 42, 9,70

Step-by-step explanation:

28 divided by 7 is 4

6 multiplied by 7 is 42

63 divided by 7 is 9

7 multiplied by 10 is 70

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:

i think it would be 42cm