Number System The difference between 8% of a number and 3% of the same number is 39. What is 2.8% of that number ? 27.84 24.84 21.84 25.84 27.84 24.84 21.84 25.84 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x.∴ x(8 - 3)% = 39x = 3900/5 = 780∴ 2.8% of 780= 780 x 2.8/100 = 21.84
Number System How many times the keys of a typewriter have to be pressed in order to write first 400 counting numbers? 1092 1082 1192 1200 1092 1082 1192 1200 ANSWER DOWNLOAD EXAMIANS APP
Number System The sum of two numbers is 165 and the difference between them is 9. What is the average of these two numbers ? 85.5 83.5 84.5 82.5 85.5 83.5 84.5 82.5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x + y = 165x - y = 92x = 174 ∴ x = 87 and y = 78∴ x + y/2 = 165/2 = 82.5
Number System 384×12×2=? 6123 7487 9216 8465 6123 7487 9216 8465 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 9216
Number System 3√103820 x 3√274620 = ? 3045 3035 3055 3065 3045 3035 3055 3065 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 3√103820 = 47 and 3√274620 = 65 ∴ ? = 47 x 65 = 3055
Number System If the product of two successive positive integers is 4692, what is the smaller number ? 64 68 66 70 64 68 66 70 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ∵ 68 x 69 = 4692
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