Number System Supply the missing figure : 2, 6, 12, 20, 30 ... 56 41 40 39 42 41 40 39 42 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 42
Number System A, B, C, D and E are consecutive even numbers respectively. The average of 5 numbers is 82. What is the product of C and E ? 6353 6363 6383 6373 6353 6363 6383 6373 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x + x + 1 + x + 2 + x + 3 + x + 4 = 5 x 82= 5x + 10 = 410 = 5x = 400= x = 400/5 = 80 ∴ A = 80C = 82and E = 84= C x E = 82 x 84 = 6383
Number System Which one of the following represents the sum of the first n even numbers? N(N – 1) N(N + 1) N2+ 1 N2 N(N – 1) N(N + 1) N2+ 1 N2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP N (N + 1)
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 If 4 2/3 is subtracted form 10 1/2 and the difference is multiplied by 450, then what is the final answer? 2675 2725 2875 None of these 2675 2725 2875 None of these ANSWER DOWNLOAD EXAMIANS APP
Number System If a number is multiplied by. three-fourth of itself, the value thus obtained is 10800. What is that number ? 180 60 120 260 180 60 120 260 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.∴ x x 3x/4 = 10800= x² = 10800 x 4/3 = 14400∴ x = √14400 = 120
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