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ssc preparation, important competetion questions, current affairs of india, latest question asked in competetion papers, Percent age Quantitative Aptitude PDF The word “percent” is derived from the latin words “per centum”, which means “per hundred”. A percentage  is a fraction with denominator hundred, It is denoted by the symbol %. Numerator of the fraction is called the  rate per cent. VALUE OF PERCENTAGE: Value of percentage always depends on the quantity to which it refers: Consider the statement, “65% of the students in this class are boys”. From the context, it is understood that boys from 65% of the total number of students in the class. To know the value of 65%, the value of the total number of student should be known. If the total number of student is 200, then, The number of boys =130; It can also be written as (200) × (0.65) =130. Note that the expressions 6%, 63%, 72%, 155% etc. Do not have any value intrinsic to themselves. Their values depend on the

ssc preparation, important competetion questions, current affairs of india, latest question asked in competetion papers, Ratio, Proportion & Partnership Study Material RATIO Ratio is strictly a mathematical term to compare two similar quantities expressed in the same units. The ratio of two terms ‘x’ and ‘y’ is denoted by x:y. In general, the ratio of a number x to a number y is defined as the quotient of the numbers x and y. The numerator of the ratio is called the antecedent (x) and the denominator is called consequent (y) of the ratio. COMPARISON OF TWO OR MORE RATIOS Two or more ratios may be compared by reducing the equivalent fractions to a common denominator and then comparing the magnitudes of their numerator. Thus, suppose 2:5, 4:3 and 4:5 are three ratios to be compared then the fractions  and  are reduced to equivalent fractions with a common denominator. For this, the denominator of each is changed to 15 equal to the L.C.M. their denominators. Hence the

ssc preparation, important competetion questions, current affairs of india, latest question asked in competetion papers, FACTORS A number may be made by multiplying two or more other numbers together. The numbers that are multiplied together are called factors of the final number. Factors of 12 = 1,2,3,4,6, and 12. All the numbers have a factor of one. Common factor:  A common factor of two or more given numbers is a number which divides each given number completely. Common factor of 12 and 18 are 1,2,3,6. Co-prime numbers:  Two or more numbers that do not have a common factor are known as co-prime or relatively prime. For example: 4 and 15 are Co-prime numbers. Download RRB JE Study Material Highest common factor:  The highest common factor (H.C.F.) of two or more numbers is the greatest number which divides each of them exactly. It is also known as greatest common divisor (GCD.). H.C.F. can be calculated by: (i) Prime factorization method (ii) Division metho