Successive Discount Formula and Equivalent Discount
Convert two or three successive discounts into one equivalent discount and compare offers
Read →Train Problems: Crossing a Pole, Platform and Another Train
Choose the right distance (train length, plus platform, plus other train) for each crossing type
Read →Boats and Streams: Upstream and Downstream Formulas
Find boat and stream speed from upstream and downstream speeds, including round trips
Read →Pipes and Cisterns: Inlets, Outlets and Leaks
Treat inlets as positive and outlets and leaks as negative work, and find fill or empty time
Read →Difference Between CI and SI for 2 and 3 Years
Use P(r/100)² and P(r/100)²(3 + r/100) and derive them
Read →Dishonest Dealer and False Weight Problems
Find the gain from false weights, with and without a stated profit or loss percentage
Read →Alligation Rule for Mixture Problems
Use the alligation cross to mix two prices or concentrations and when the rule does not apply
Read →Average Speed Formula: Why It Is Not the Simple Mean
Derive 2xy/(x+y) and extend it to three equal distances and unequal distances
Read →Time and Work: The LCM (Total Work) Method
Solve two- and three-person work problems by taking total work as the LCM
Read →Price Rise and Consumption Cut: Product Constancy
Find the cut in consumption that keeps expenditure constant, and related area and speed cases
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