Number System The difference between a number and its three-fifth is 50. What is the number? 75 100 125 None of these 75 100 125 None of these ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x - 3/5 x = 50 => 2/5 x = 50x = (50 * 5)/2 = 125.
Number System Complete the series : 1, 8, 27, 64, 125, 216 ..... 363 373 353 343 363 373 353 343 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 343
Number System Two-third of a positive number and 25/216 of its reciprocal are equal. The number is: 144/25 12/5 25/144 5/12 144/25 12/5 25/144 5/12 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 A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is: 24 81 18 42 24 81 18 42 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the ten's and unit's digit be x and 8/x respectively. Then, (10x + 8/x) + 18 = 10 * 8/x + x 9x2 + 18x - 72 = 0 x2 + 2x - 8 = 0 (x + 4)(x - 2) = 0 x = 2 So, ten's digit = 2 and unit's digit = 4. Hence, required number = 24.
Number System The sum and the product of two numbers are 25 and 144 respectively, the difference of the number is? 11 3 7 5 11 3 7 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 What will be the next number in the following number series ? 191 182 177 162 191 182 177 162 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 1² + 1, 3² + 3, 5² + 5, 7² + 7
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