Book excerpt: Algebra & Number System is an important part of Quantitative Aptitude Section of SSC CGL, CPO, CHSL, and other such competitive examinations. Advanced mathematics makes fifty to sixty per cent part of the Mains examination of SSC CGL out of which thirty percent questions are based on Geometry. Also, as per a recent change observed in the trend of these examinations, the mensuration questions now being asked are difficult to solve when compared to previous examinations. So, it becomes a must for all the SSC aspirants not to give this portion a cold shoulder. Salient Features of The Cracker Practice eBook For Algebra and Number System 1300+ Questions 580+ Previous Years' Questions Important Concepts and Formulas 20 Practice sets based on latest Pattern. 10 Challenger (Tough) Practice sets