Number System What is the sum of 1 + 2 + 3+ ... + 27 ? 382 343 378 396 382 343 378 396 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Sum = 27 x (27 + 1)/2= 27 x 28/2= 27 x 14= 378
Number System The sum of the two digits of a two-digit number is 15 and the difference between the two digits of the two digit number is 3. What is the product of the two digits of the two digit number ? 36 14 None of these 54 36 14 None of these 54 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be 10 x + yWhere x > yAccording to the question,x + y = 15 and x - y = 3Solving both the equations,x = 9, y = 6∴ x x y = 9 x 6 = 54
Number System 17580 x 1.8 - 13720 x 2.1 = ? x 2.4 1140 1180 1120 1160 1140 1180 1120 1160 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2.4 x ? = 31644 - 28812 = 2832∴ ? = 2832/2.4= 1180
Number System In an examination, 68% of the total examinees passed. If the number of failures is 248, the total number of examinees is 775 640 750 725 775 640 750 725 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Failed students are 32% which is 248.∴ Total = 24800/32 = 775
Number System When the square of a number is substracted from (68)², the answer so obtained is 2508. What is the number ? 44 46 47 45 44 46 47 45 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP (68)² - x² = 2508Therefore, x² = 4624 = 2508Therefore, x = root of 2116 = 46
Number System What is the sum of all even numbers from 1 to 701? 122550 123850 122500 122850 122550 123850 122500 122850 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 700/2 = 350350 * 351 = 122850
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