Question

a car can drive 600 miles on 18 gallons of gasoline. How many miles can a car drive on 15 gallons of gasoline​

Answer 1

it would be about 500 miles. if you divide 600 by 18 to get the miles for 1 gal (about 33.3). then you multiply it by 15 to get the 500 (499.5 rounded up)

Answer 2

Use the cross technique if it’s name like that in English but , I wish you can understand it from what I‘ve written .