Number System If one-third of one fourth of a number is 15, then three-tenth of that number is: 25 45 54 35 25 45 54 35 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x. Then,1/3 of 1/4 of x = 15x = 15 * 12 = 180So, required number = (3/10 * 180) = 54.
Number System The difference between a two-digit number and the number obtained by interchange the two digits of the number is 27. If the sum of the two digits of the number is 13, what is their product ? 39 37 38 40 39 37 38 40 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be 10x + y.∴ 10x + y - (10y + x) = 27or 9x - 9y = 27∴ x - y = 3 .......(I)x + y = 13 .......(II)From eqn (I) and (II)x = 8 and y = 5.So the number = 85Therefore, product = 8 x 5 = 40
Number System What is the sum of 1 + 2 + 3+ ... + 27 ? 396 382 343 378 396 382 343 378 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Sum = 27 x (27 + 1)/2= 27 x 28/2= 27 x 14= 378
Number System What is the least number, which is perfect square but contains 2700 as its factor? 1800 2700 5400 10800 1800 2700 5400 10800 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 900 * 3 * 3 = 8100
Number System What is the difference between the largest and the smallest number written with 7, 7, 0, 7? 693 6893 6093 6993 693 6893 6093 6993 ANSWER DOWNLOAD EXAMIANS APP
Number System How many numbers up to 100 are divisible by 7? 93 100 107 14 93 100 107 14 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 100/7 = 14 2/7 => 14 Numbers
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