This is the solution of the last 5 problems in * SSC CGL Solution set 81 on Algebra 17* from suresolv.com and is rich in learning. Use of basic concepts and smart methods results in quick mental solution for all 5 problems.

For smart quick solutions the most important skillset is to discover useful patterns and use the associated methods. A few of the important patterns and methods used are, three variable zero sum principle, quotient choice technique, coefficient comparison technique, ratio concept, zero valued factor extraction, three variable sum of cubes, collection of like terms and mathematical reasoning.