Number System The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is: 4/5 3/5 5/4 3/10 4/5 3/5 5/4 3/10 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 Pick the wrong number from the given number series. 3,4,10,33,135,685,4116 685 33 10 135 685 33 10 135 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP The correct number is 136.3 x 1 + 1 = 44 x 2 + 2 = 1010 x 3 + 3 = 3333 x 4 + 4 = 136136 x 5 + 5 = 685685 x 6 + 6 = 4116
Number System Two third of three- fifth of one fourth of a number is 24, what is 30% of that number? 72 69 42 90 72 69 42 90 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP x * 2/3 * 3/5 * 1/4 = 24x = 240240 * 30/100 = 72
Number System (√6 + 1)² = ? + 2√6 7 6 8 5 7 6 8 5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? = (√6 + 1)² - 2√6= (√6)² + 2 x √6 + 1 + 1² - 2√6= 6 + 2√6 + 1 - 2√6 = 6 + 1 = 7
Number System If the product of two successive positive integers is 4692, what is the smaller number ? 64 70 66 68 64 70 66 68 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ∵ 68 x 69 = 4692
Number System When 102 is reduced from a number, the number gets reduced by 88%. What is that number ? 850 650 750 550 850 650 750 550 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP 850
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