Pipes and Cisterns, Time and Distance, and Trains.
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This is the backbone of most competitive exams. The book covers fundamental operations, number systems, HCF and LCM, fractions, and decimals. It moves progressively into percentage, profit and loss, simple and compound interest, ratio and proportion, partnership, mixture and allegation, time and work, pipes and cisterns, and time, speed, and distance. Pipes and Cisterns, Time and Distance, and Trains