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Quantitative Aptitude Questions and Answers contains concepts and test papers on many topics such as average, numbers, compound interests, partnership, problem on ages, calendar, boats and streams, clock, height and distance, percentage, pipes and cisterns, profit and loss, speed, time and distance, simple interest and so on.  For example (51 + 52 + 53 + .........+100) is equal to. or What least number must be subtracted from 13601, so that the remainder is divisible by 87 ?