Martin had red toy cars and blue cars in a box. the ratio of the blue toy cars to the red toy cars is 5:2. When Martin put 15 more blue toy cars in the box, the ratio of the blue toy cars to the red toy cars became 4:1. How many red toy cars and blue toy cars are now in the box?

Answer 1

see

http://www.jiskha.com/display.cgi?id=1473791919

same problem, different numbers.