Number System A number when multiplied by five times of itself give the value equal to 1445. What is the number ? 17 16 18 15 17 16 18 15 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x x 5x = 1445= 5x² = 1445= x² = 289∴ x = 17
Number System If the fraction 8/6, 7/5, 18/13, 9/5 and 7/11 are arranged in descending order of their values, which one will be the second ? 1/9 7/5 3/4 2/7 1/9 7/5 3/4 2/7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 8/6 = 1. 333, 7/5 = 1.4, 18/13 = 1.3849/5 = 1.8 and 7/11 = 0.636Therefore, Descending order is 9/5 > 7/5 > 18/13 > 8/6 > 7/11Therefore Second fraction is 7/5
Number System 217 * 217 + 183 * 183 = ? 80698 80578 81268 79698 80698 80578 81268 79698 ANSWER DOWNLOAD EXAMIANS APP
Number System In how many different ways can the letters of word 'BIOLOGY' be arranged ? 2678 2410 2520 2367 2678 2410 2520 2367 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In BIOLOGY total 7 letters are there but O comes twice.∴ Number of arrangements = 7!/2! = 2520
Number System (12.11)2 + (?)2 = 732.2921 24.2 17.2 20.2 14.2 24.2 17.2 20.2 14.2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 24.2
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 42 81 18 24 42 81 18 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.
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