Placement Preparation

How to Solve Time and Work Problems

Time and work problems are solved by converting each worker’s output into a rate (work done per unit time), adding rates when workers combine, and using total…

How to Solve Percentage Problems

Percentage problems are solved by treating "percent" as "per hundred": x% of a number is (x/100) × number, and a percentage change is (change ÷ original) × 100.

How to Solve Profit and Loss Problems

Profit and loss are always calculated on the cost price: Profit = SP − CP, Loss = CP − SP, and the percentage is (Profit or Loss ÷ CP) × 100.

How to Solve Ratio and Proportion Problems

A ratio compares two quantities (a : b), and a proportion states that two ratios are equal (a : b = c : d); most problems are solved by introducing a common mu…

How to Solve Time, Speed and Distance Problems

Time, speed and distance problems all reduce to one relation: Distance = Speed × Time, rearranged as Speed = Distance ÷ Time or Time = Distance ÷ Speed, with c…

How to Solve Simple and Compound Interest Problems

Simple interest grows linearly on the original principal (SI = P×R×T/100), while compound interest grows on principal plus accumulated interest, giving CI = P×…

How to Solve Averages Problems

The average of a set is the sum of all values divided by the count, and most averages problems are solved by tracking the total sum rather than the average its…

How to Solve Problems on Ages

Problems on ages are solved by assigning variables to present ages, translating "years ago" and "years hence" into simple linear expressions, and forming equat…

How to Solve Permutation and Combination Problems

Permutations count arrangements where order matters (nPr = n!/(n−r)!), while combinations count selections where order does not matter (nCr = n!/(r!(n−r)!)); t…

How to Solve Probability Problems

Probability of an event is favorable outcomes divided by total possible outcomes, P(E) = n(E)/n(S), and most problems are solved by carefully counting both usi…

How to Solve Number Series Problems

Number series problems are solved by finding the pattern between consecutive terms — a constant difference, a constant ratio, a difference-of-differences, or a…

How to Solve Boats and Streams Problems

Boats and streams problems are solved by adding the stream’s speed to the boat’s speed for downstream travel and subtracting it for upstream travel, then apply…

How to Solve Pipes and Cisterns Problems

Pipes and cisterns problems extend time-and-work: an inlet pipe fills at a positive rate (1/a of the tank per hour), an outlet pipe drains at a negative rate (…

How to Solve Partnership Problems

Partnership problems split profit in the ratio of each partner’s capital multiplied by the time it was invested, so the profit-sharing ratio is capital₁ × time…

How to Solve Mixture and Alligation Problems

Mixture and alligation problems find the ratio in which two ingredients of different values (price, concentration, etc.) must be mixed to hit a target average,…

How to Solve HCF and LCM Problems

HCF (highest common factor) is the largest number dividing all given numbers, LCM (least common multiple) is the smallest number divisible by all of them, and…

How to Solve Calendar Problems

Calendar problems are solved by counting "odd days" — the remainder when total days between two dates are divided by 7 — since the day of the week repeats ever…

How to Solve Clock Problems

Clock problems are solved by treating the minute hand and hour hand as two objects moving at fixed angular speeds — 6° per minute and 0.5° per minute respectiv…

How to Solve Blood Relation Problems

Blood relation problems are solved by drawing a family tree diagram as each clue is read, using generation levels (rows) and gender-tagged nodes, then tracing…

How to Solve Direction Sense Problems

Direction sense problems are solved by plotting each movement on an imaginary compass grid — treating North as up, East as right — and tracking left/right turn…

How to Solve Coding-Decoding Problems

Coding-decoding problems are solved by finding the fixed rule that maps each letter or word to its code — usually a shift in the alphabet, a position swap, or…

How to Solve Syllogism Problems

Syllogism problems are solved by drawing Venn diagrams for each given statement and then checking which conclusions are true in every possible diagram consiste…

How to Solve Seating Arrangement Problems

Seating arrangement problems are solved by fixing the most constrained clue first (a definite position or a strong relative clue), placing it on a diagram, the…

How to Solve Data Interpretation Problems

Data interpretation problems are solved by first reading the chart’s axes, units and legend carefully, then extracting only the specific numbers each question…