A truck driver can travel 560 miles on 28 gallons of gas. How far can he travel on 35 gallons of gas?

560 / 28 = 20 ... so the driver travels 20 miles per gallon

on 35 gallons ... 35 * 20 = 700 miles <==

or u can also do it this way ...

560/28 = x / 35 ... 560 miles to 28 gal = x miles to 35 gal

cross multiply because this is a proportion

(28) (x) = (560) (35)

28x = 19600

x = 19600/28

x = 700 miles <==

so u can either do it by finding the unit rate or by making a proportion. either way will result in the same answer.