Tips and Tricks on Alligation

Alligation:It is the rule that enables us to find the ratio in which two or more ingredients at the given price must be mixed to…

Problem solving tricks on sales and discount

IMPORTANT CONCEPTS Suppose a man has to pay Rs. 156 after 4 years and the rate of interest is 14% per annum. Clearly, Rs. 100…

Tips and Tricks on Bank Account

IMPORTANT CONCEPTS Banker’s Discount: Suppose a merchant A buys goods worth, say Rs. 10,000 from another merchant B at a credit of say 5 months.…

Tips and Tricks To Solve Problems on Races and Games

Races: A contest of speed in running, riding, driving, sailing or rowing is called a race. Race Course: The ground or path on which contests are made…

Missing Letter Puzzle for Interviews, Placement and Competitive Exams

MISSING LETTER PUZZLES Answer : K Explanation : The numerical values of the letters in opposite segments of the circle always add up to 17.…

Missing Number puzzles: Interviews, Placements and Competitive Exams

MISSING NUMBER PUZZLES   Answer : 6 Explanation : Looking at the diagram in rows, the central circle equals half the sum of the numbers…

Important algebra identities and questions

Some Basic Formulae: (a + b)(a – b) = (a2 – b2) (a + b)2 = (a2 + b2 + 2ab) (a – b)2 = (a2 + b2 – 2ab) (a + b + c)2 = a2 + b2 + c2 + 2(ab + bc + ca) (a3 + b3) = (a + b)(a2 – ab + b2) (a3 – b3) = (a – b)(a2 + ab + b2) (a3 + b3 + c3 – 3abc)…

Tricks to solve surds and indices

Laws of Indices: am x an = am + n am = am – n an (am)n = amn (ab)n = anbn a n = an b bn a0 = 1 Surds:Let a be rational number and n be a positive integer such…

Tips and Tricks related to Stocks and Shares

Stock Capital:The total amount of money needed to run the company is called the stock capital. Shares or Stock:The whole capital is divided into small units,…

Short cut tricks to find square root and cube root of a number

CUBE ROOT OF A NUMBER REMEMBERING UNITS DIGITS: First we need to remember cubes of 1 to 10 and unit digits of these cubes. The…