Kevin went to see his favorite sports team play his car can go 300 miles on one tank of gas if he used 40% of a full tank how many miles did he travel

To find the percentage of something you must multiply it by that number divided by 100. So if it were  25% then you would times 300 by 0.25.
in this case though it is 40% of three hundred, so you would make it a decimal and times 300 by 0.4. which would result in 120 miles