Lets figure this out... The starting ratio is 2:15. We need a new ratio with 225 cars. Let b represent the number of blue cars. 2:15=b:225 Divide 225 by 15. You should get 15. That means each side of the original ratio needs to be multiplied by 15. 2x15=30 15x15=225 So, the new ratio is 30:225. There are 30 blue cars. Hope this helps : )
