There's an easy way to solve this. The ratio is 7:3 as cars:trucks The difference is that it starts off with 4 more cars than trucks. We want to find how many of each are there when there are 16 more cars than trucks. 16÷4 4 Let's multiply each side of the ratio by 4. 7×4 28 3×4 12 28-12=16 So there will be 28 cars and 12 trucks.