Aptitude

Important Formulae

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Important Formulae

Problems on Trains Time and Distance Time and Work Profit and Loss Problems on Ages Average Permutation and Combination H.C.F and L...

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True Discount - Important Formulae

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 at 14% wil...

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Races and Games - Important Formulae

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

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Boats and Streams - Important Formulae

Downstream/Upstream: In water, the direction along the stream is called  downstream . And, the direction against the stream is called  ...

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Ratio and Proportion - Important Formulae

Ratio: The ratio of two quantities  a  and  b  in the same units, is the fraction   and we write it as  a  :  b . In the ratio  a  : ...

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Simplification - Important Formulae

'BODMAS' Rule: This rule depicts the correct sequence in which the operations are to be executed, so as to find out the value o...

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Problems on Numbers - Important Formulae

Some Basic Formulae: ( a  +  b )( a  -  b ) = ( a 2  -  b 2 ) ( a  +  b ) 2  = ( a 2  + b 2  + 2 ab ) ( a  -  b ) 2  = ( a 2  + ...

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Volume and Surface Area - Important Formulae

CUBOID Let length =  l , breadth =  b  and height =  h  units. Then Volume  = ( l  x  b  x  h ) cubic units. Surface area  = 2( l...

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Clock - Important Formulae

Minute Spaces: The face or dial of watch is a circle whose circumference is divided into 60 equal parts, called minute spaces. Hour H...

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Percentage - Important Formulae

Concept of Percentage: By a certain  percent , we mean that many hundredths. Thus,  x  percent means  x  hundredths, written as  x %....

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