Josh drove 410 miles using 20 gallons of gas . at this rate ,how many miles would he drive using 18 gallons of gas

Let's set up a ratio. 410 / 20 should be equal to x / 18, right? So the rate of miles per gallon in the first one is 20.5 miles per gallon. So therefore, when you have 18 gallons, that would be 20.5 * 18 which is 369. 

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410/20=20.5
1 gallon=20.5 miles
18 gallons=20.5x18
=369 miles