Number System The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is: 4/5 3/10 3/5 5/4 4/5 3/10 3/5 5/4 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 1/x - x = 9/20 20x2 + 9x - 20 = 0 20x2 + 25x - 16x - 20 = 0 5x(4x + 5) -4(4x + 5) = 0(4x + 5)(5x - 4) = 0x = 4/5
Number System The number of prime factors of (6)10×(7)17×(55)27 101 91 61 41 101 91 61 41 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 91
Number System The difference between 8% of a number and 3% of the same number is 39. What is 2.8% of that number ? 21.84 24.84 27.84 25.84 21.84 24.84 27.84 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 What is the difference between the largest number and the least number written with the digits 7, 3, 1, 4? 6084 6184 5084 6048 6084 6184 5084 6048 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 ? 83.5 85.5 82.5 84.5 83.5 85.5 82.5 84.5 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 486+32×25—59=? 596 528 582 567 596 528 582 567 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 528
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