The problem chosen in this 16th video on SSC CGL level Algebra problem solving in a few steps is fairly large but could be solved in mind by first simplifying the problem expression using component expression substitution, second by identifying the critical pattern and last by applying the three-variable zero sum principle. Working of this principle based technique is explained. The concepts and techniques are valuable as these help to solve a large variety of algebra problems in just a few steps. The video should be useful for SSC CGL Tier II, CAT or GMAT as well.
Detailed article is available at How to solve SSC CGL level algebra problem mentally in quick time 16.