Some clues and signs will let you know if you need to use the idea of direct proportions or inverse proportions. Use your common sense to figure out how the things in the RS Aggarwal Solutions for Class 8 Chapter 12 exercises are related to each other and how they act. Inverse proportion and direct proportion are easy to tell apart. All you need to know is that if you split two amounts that are the same, the ratio between them will stay the same if you do it in a straight line. In an indirect or inverse proportion, on the other hand, when one thing goes up, the other thing goes down automatically. At first, this might be hard to understand, but as you solve problems on your own, it gets easier with each question.