Number System The sum of a number and its reciprocal is one-eighth of 34. What is the product of the number and its square root? 32 27 None of these 8 32 27 None of these 8 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the number be x. Then,x + 1/x = 34/8 8x2 - 34x + 8 = 0 4x2 - 17x + 4 = 0 (4x - 1)(x - 4) = 0 x = 4required number = 4 * √4 = 4 * 2 = 8.
Number System {3√4913}² = ? 225 289 333 121 225 289 333 121 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = (3√4913)² = (17)² = 289
Number System What should come in the place of ' ? ' in the following number series ? 2, 5, 9, 19, 37, ? 78 76 75 77 78 76 75 77 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 2 x 2 + 1 = 5;5 x 2 - 1 = 99 x 2 + 1 = 19: 19 x 2 - 1 = 3737 x 2 + 1 = 75
Number System One half of a two digit number exceeds its one third by 6. What is the sum of the digits of the number? 5 3 7 9 5 3 7 9 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x/2 – x/3 = 6=> x =63 + 6 = 9
Number System The simplest form of 1.5 : 2.5 is : 17 : 19 13 : 11 3 : 5 5 : 7 17 : 19 13 : 11 3 : 5 5 : 7 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 3 : 5
Number System The cost of 87 pens and 29 pencils is `783. What is the cost of 90 pens and 30 pencils ? Rs. 800 Rs. 810 Rs. 830 Rs. 820 Rs. 800 Rs. 810 Rs. 830 Rs. 820 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the price of a pen be 'x' and that of pencil be 'y' Then 87x + 29y = 783Multiplying eqn (i) by 30/29 we get (87x) x 30/29 + (29y) 30/29 = 783 x 30/29∴ 90x + 30y = 810
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