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UPSC CDS

Ratio and proportion

thumb_ratio and proportion

A ratio defines how many times is one quantity with respect to another of same type. It is expressed as a minimized fraction and its numerator is called antecedent and denominator consequent. In practice these terms are not very important...

HCF and LCM

thumb_hcf and lcm

Highest Common Factor or HCF is the largest factor that divides two or more numbers under consideration. It is the largest among all the factors common to the set of numbers under consideration. The LCM is the smallest number that is divisible by the set of given numbers. In other words, LCM is the least common multiple of the set of given numbers...

How to solve Arithmetic mixture problems in a few simple steps 2

thumb_How to solve arithmetic mixing liquids problems in simple steps2

The problems involving Mixture of liquids (and sometimes solids in alloy form) are taught in schools and also form an important part of most of the competitive job tests such as SSC CGL, Bank POs etc. This subtopic belongs to Arithmetic and we have found that students find some difficulties in solving these problems...

How to solve Arithmetic mixture problems in a few simple steps 1

thumb_How to solve arithmetic mixing problems in a few simple steps 1

The problems involving Mixture of liquids (and sometimes solids in alloy form) are taught in schools and also form an important part of most of the competitive job tests such as SSC CGL, Bank POs etc. This subtopic belongs to Arithmetic and we have found that students find some difficulties in solving these problems...

How to solve Time and Distance problems in a few simple steps 1

thumb_How to solve time and distance problems in a few simple steps 1

Time and distance problems are taught in middle schools and also form an important component in competitive tests. In any case, our endeavor is to solve such problems elegantly in a few simple steps in contrast to generally complex and time consuming conventional approach to solving such problems...

How to solve more Time and Work problems in simpler steps, type 2

thumb_How-to-solve-time-work-problems-in-simpler-steps-type2

In a large number of math problems involving Time & Work, it is stated that certain number of men take certain number of days to complete the work. These problems are usually solved in conventional methods by using per day work rate of 1 man. Instead, the number of days and number of men can be combined into a single powerful measure of work amount, simplifying the process greatly...

How to solve Time and Work problems in simpler steps, type 1

thumb_How to solve time work problems in simpler steps type1

To solve math problems involving Time & Work, it is usually assumed that a work-agent takes certain number of time units to complete the work alone. This immediately forces the use of inverse of the variables corresponding to each work-agent. Instead, adopt conceptually and psychologically a much simpler approach...

How to solve similar problems in a few seconds, Profit and loss problem 2, Domain modeling

thumb_How to solve in a few seconds profit and loss problem 2, Domain modeling

A man sells two wrist watches one at a profit of 50% and another at a loss of 50%, but each at a same selling price of Rs.300. The net profit or loss is...This type of problem can be solved in a few seconds if you can form its Domain model by Abstraction and Repeated solving of similar problems with controlled variation...

How to solve in a few steps, Profit and loss problem 1

thumb_How to solve in a few steps profit and loss problem 1

A man sells two wrist watches one at a profit of 30% and another at a loss of 30%, but each at a same selling price of Rs.400. The net profit or loss is...This type of problem can be solved following clear steps based on basic concepts of profit and loss only. This is conventional approach of problem solving...

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