Number System What is the sum of all the prime numbers from 20 to 40? 119 117 120 118 119 117 120 118 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 23 + 29 + 31 + 37 = 120
Number System How many times the keys of a typewriter have to be pressed in order to write first 400 counting numbers? 1200 1082 1192 1092 1200 1082 1192 1092 ANSWER DOWNLOAD EXAMIANS APP
Number System 35 + 15 * 1.5 = ? 57.5 5.25 51.5 75 57.5 5.25 51.5 75 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Given Exp. = 35 + 15 * 3/2 = 35 + 45/2 = 35 + 22.5 = 57.5
Number System The product of two consecutive odd numbers is 4095 What is the greater number ? 65 69 61 74 65 69 61 74 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the two consecutive odd numbers be 2x - 1 and 2x + 1.(2x - 1) (2x - 1) = 4095= 4x² - 1 = 4095= 4x² = 4096= x² = 1024∴ x = 32∴ The numbers are 63 and 65.Greater number = 65
Number System What will be the next number in the following number series ? 162 177 191 182 162 177 191 182 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 1² + 1, 3² + 3, 5² + 5, 7² + 7
Number System ind the number, difference between number and its 3/5 is 50 123 125 120 124 123 125 120 124 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number = x,Then, x-(3/5)x = 50,=> (2/5)x = 50 => 2x = 50*5,=> x = 125
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