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Table of Contents Ratio and Proportion Partnership Mixtures and Allegation Average Percentage Profit, Loss and Discount Problems on Ages Time, Speed and Distance Trains Boats Time and Work Pipes and Cisterns Simple and Compound Interest Number System HCF and LCM Heights and Distances Progressions Calendar Clocks Permutation and Combination Probability Shortcut # 1 - Ratio and Proportion Splitting a number in the given ratio. 1. Divide 720 in the ratio 2: 3. Solution 1: Total parts = 2 + 3 = 5 First number = (2/5) 720 = 288 Se