The fuel mileage on Ryan's car is 20 miles per gallon. After filling the tank, which has a capacity of 15 gallons, how far can he go before his car runs out of gas? I say 300 miles, is this correct?

Right.

To find out how far Ryan can go before his car runs out of gas, we can multiply the fuel mileage of his car by the tank capacity.

The fuel mileage of Ryan's car is 20 miles per gallon, and the tank capacity is 15 gallons.

To find the total distance Ryan can go, we multiply 20 miles per gallon by 15 gallons:

20 miles/gallon * 15 gallons = 300 miles

So, yes, your answer of 300 miles is correct. Ryan can go 300 miles before his car runs out of gas.