Number System Which one of the following is the sum of the numbers 1, 3, 5, 7, 9…. up to nth number? N(N + 1)/2 N2 N2 + 1 N(N + 1) N(N + 1)/2 N2 N2 + 1 N(N + 1) ANSWER DOWNLOAD EXAMIANS APP
Number System The average age of seven boys sitting in a row facing North is 26 years. If the average age of first three boys is 19 years and the average age of last three boys is 32 years, what is the age of the b 30 years 31 years 28 years 29 years 30 years 31 years 28 years 29 years ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Age of the fourth boy = (26 x 7 - 3 x 19 - 3 x 32) years = (182 - 57 - 96) years = 29 years
Number System What is the value of 8/11 of 5/7 of 96% of 28875 ? 12900 14400 15400 13800 12900 14400 15400 13800 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Number = 8 x 5 x 96 x 28875/11 x 7 x 100 = 14400
Number System If the numerator of a fraction is increased by 200% and the denominator by 300%, the fraction thus obtained is 1/36. What is the original fractions ? 5/9 4/9 6/9 3/9 5/9 4/9 6/9 3/9 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the fractions be x/yx + 200% of x/y + 300% of y = 1/3= x + 2x/y + 3y = 1/3= 3x/4y = 1/3Hence x/y = 4/9
Number System The sum of the ages of a son and father is 65 years. After 5 years the age of father will be double of the age of son. What is the age of son ? 18 years 20 years 17 years 19 years 18 years 20 years 17 years 19 years ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the age of the son be x and the age of the father be y.Therefore, x + y = 65 ..........(i)or, 2 x (x + 5) = (y + 5)or, 2x + 10 = y + 5or, 2x - y = 5 ...................(ii)From equations (i) and (ii), x = 20, y = 45
Number System Find the least number which when divided by 35 and 11 leaves a remainder of 1 in each case. 391 384 386 388 391 384 386 388 ANSWER DOWNLOAD EXAMIANS APP
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