Number System The difference between 8% of a number and 3% of the same number is 39. What is 2.8% of that number ? 25.84 24.84 21.84 27.84 25.84 24.84 21.84 27.84 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 The sum and the product of two numbers are 25 and 144 respectively, the difference of the number is? 7 11 3 5 7 11 3 5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x + y = 25xy = 144(x- y)2 = (x + y)2 – 4xy(x- y)2 = 625 – 576 => (x – y) = 7
Number System 7432 ÷ 32 x ? = 2787 21 41 78 12 21 41 78 12 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 7432/32 x ? = 2787= ? = 2787 x 32/7432 = 12
Number System The difference between a number and its three-fifth is 50. What is the number? 100 75 None of these 125 100 75 None of these 125 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x - 3/5 x = 50 => 2/5 x = 50x = (50 * 5)/2 = 125.
Number System In how many different ways can the letters of word "COLLEGE" be arranged ? 1300 1280 1260 1240 1300 1280 1260 1240 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Number of ways = 7!/2!2! = 1260(∵ L and E come twice)
Number System If (182)² is added to the square of a number, the answer so obtained is 47765. What is the number ? 101 121 131 111 101 121 131 111 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the no. be xTherefore x² + (182)² = 47765Therefore x² = 47765 - (182)2 = 47765 - 33124Therefore x² = 14641, Therefore x = 121
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