Notice Regarding IBPS RRB EXAM 2020

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Number System - Types of Number

This post forms a basis of many other topics in quantitative aptitude . Let us begin by understanding various types of numbers. (1) Natural Numbers: All the counting numbers are called natural number. Example: 1, 2, 3, 4, 5, ...... (a) Even Numbers: The numbers which are exactly divisible by 2 are called even numbers. Example: 2, 4, 6, 8, ... (b) Odd Numbers: The numbers which leave a remainder 1 when divided by 2 are called odd numbers. Example: 1, 3, 5, 7, .... (c) Prime Numbers: If a number is not divisible by any other number except 1 and itself, it is called a prime number. Example: 2, 3, 5, 7, 11, .... Co-primes ® Two numbers which have no common factor between them except 1 are said to be co-prime to each other. The two numbers individually may be prime or composite. Example: 13 and 29 are co-primes. (d) Composite Numbers: Numbers which are divisible by other numbers along with 1 and itself are called composite numbers. Example: 4, 6, 8, 9, 10, ..... The number 1 is neither prim...
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Percentage - basics , word problems based on percentage

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Percentage - percentage means for every hundred. A percentage is a number or ratio that represents a fraction of 100. It is often denoted by the symbol "%" or simply as "percent"  New Number When a Number Is Increased/Decreased by a Certain Percent       Word Problems Based On Percentage  Question 1 Ramola’s monthly income is three times Kavita’s monthly income. Kavita’s monthly income is 25% more than Ruchi’s monthly income. Ruchi’s monthly income is Rs. 34000. What is Ramola’s Annual income?  Answer - Question 2  Five-ninth of sixty two percent of a number is equal to 2790. What is the number?  
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Simplification - Introduction, VBODMAS Rule, Some Important Formula

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In this post we will discuss what is simplification, VBODMAS Rule, and some important formula related to simplification.  SIMPLIFICATION  Simplification is a process of reducing a complex arithmetical expression into a simple expression. A Simple technique for arranging the expression into the proper sequence is chronologically involved VBODMAS Rule which is explained below Following formulae are useful in various Operations on simplification
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