The five problems are not easy but could all be solved quickly enough by pattern discovery and application of suitable techniques. This set of solutions is rich in learning. The solutions and concepts are explained in details. Important concepts used are mathematical reasoning, pattern discovery, simplifying a long expression by factoring out a zero valued factor in every pair of terms, graphical algebra, simplifying by dummy variable substitution and sum of inverses conversion. The Concepts and Techniques form the BASIC SKILLSET for solving harder algebra problems EASILY IN MIND.
These are the first 5 questions 1 to 5 and form the 1st part of video on the article SSC CGL Solution set 23, Algebra 8 from SureSolv.com.