Arithmetic in school settings

Covers: Averages and weighted averages; section transfer problems; Percentages, successive change, fee-hike revenue; Marks scaling; net score under negative marking; Ratio, proportion, mixture and alligation; Costing and unit economics; profit, loss, discount; Time and work; pipes and cisterns; Time, speed, distance; ages; Simple and compound interest; Number system, divisibility, HCF, LCM