Number System When the square of a number is substracted from (68)², the answer so obtained is 2508. What is the number ? 46 44 47 45 46 44 47 45 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (68)² - x² = 2508Therefore, x² = 4624 = 2508Therefore, x = root of 2116 = 46
Number System A number consists of two digits. If the digits interchange places and the new number is added to the original number, then the resulting number will be divisible by: 5 3 9 11 5 3 9 11 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the ten's digit be x and unit's digit be y. Then, number 10x + y.Number obtained by interchanging the digits = 10y + x.(10x + y) + (10y + x) = 11(x + y)which is divisible by 11.
Number System If (74)² is added to the square of a number the answer so obtained is 7780. What is the number ? 47 50 49 48 47 50 49 48 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.or, x² + (74)² = 7780or, x² = 7780 - 5476 = 2304∴ x = 48
Number System If the fraction 8/6, 7/5, 18/13, 9/5 and 7/11 are arranged in descending order of their values, which one will be the second ? 7/5 1/9 2/7 3/4 7/5 1/9 2/7 3/4 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 8/6 = 1. 333, 7/5 = 1.4, 18/13 = 1.3849/5 = 1.8 and 7/11 = 0.636Therefore, Descending order is 9/5 > 7/5 > 18/13 > 8/6 > 7/11Therefore Second fraction is 7/5
Number System How many times the keys of a typewriter have to be pressed in order to write first 400 counting numbers? 1192 1092 1082 1200 1192 1092 1082 1200 ANSWER DOWNLOAD EXAMIANS APP
Number System What should come in place of question mark (?)? 8 : 1 1 : : 72: 99 79 89 109 99 79 89 109 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let ? = xTherefore 8 : 11 : 72 : xTherefore x = (11 x 72) / 8 = 99
EXAMIANS