The five problems are not easy but could all be solved quickly enough by pattern discovery and application of suitable techniques. The solutions and concepts are explained in details. Important concepts used are mathematical reasoning, pattern discovery, sum of inverses conversion, sum of inverses power down and hidden three variable zero sum principle. 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 33, Algebra 9 from SureSolv.com.