To solve this problem, we can divide 165 people by 15 to start to find out how many cars there will be for 165 people. This is because this is a proportion. 165 divided by 15 is 11. Since 165:15 = 11, that means that C:3 = 11 too (with C being the number of cars for 165 people). If C:3 = 11, we can multiply each side by 3 to figure out the C is equal to 33 (we multiply by 3 to get rid of the denominator, since the : sign means to divide). That means that 33 cars will be needed for 165 people.
