Number System What should come in place of (?) in the following series ? 10, 19, 30, 43, 58, ? 75 76 77 78 75 76 77 78 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The series is: +9, +11, +13, +15, +17
Number System How many times the keys of a typewriter have to be pressed in order to write first 400 counting numbers? 1192 1082 1200 1092 1192 1082 1200 1092 ANSWER DOWNLOAD EXAMIANS APP
Number System Let R = qs—4. When s=8, R=16. When s=10, R is equal to 21 22 20 23 21 22 20 23 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 21
Number System The sum of four consecutive even numbers is 36. Find the sum of the squares of these numbers? 344 252 296 388 344 252 296 388 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the four numbers be x, x + 2, x + 4 and x + 6.=> x + x + 2 + x + 4 + x + 6 = 36=> 4x + 12 = 36 => x = 6The numbers are 6, 8, 10 and 12.Sum of their squares = 62 + 82 + 102 + 122 = 36 + 64 + 100 + 144 = 344.
Number System Two-third of a positive number and 25/216 of its reciprocal are equal. The number is: 5/12 12/5 144/25 25/144 5/12 12/5 144/25 25/144 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x. Then,2/3 x = 25/216 * 1/xx2 = 25/216 * 3/2 = 25/144 x = 5/12
Number System The product of two consecutive odd numbers is 6723. Find is the greater number. 83 80 85 77 83 80 85 77 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the first odd number be x.Then, the other odd number would be x + 2.∴ x(x+2) = 6723= x2 + 2x = 6723= x2 + 2x = 6723= x2 + 2x - 6723 = 0= x2 + 83 - 81 x - 6723 = 0= x(x+83) - 81 (x + 83) = 0= (x + 83) (x - 81) = 0= (x + 83) (x - 81) = 0= x - 81 = 0∴ x = 81Hence, greater number = x + 2 = 81 + 2 = 83
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