The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is:
Select the correct option
A) 3/5	B) 3/10	C) 4/5	D) 5/4	E) 6/4
Let the required fraction be x. Then,   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) = 0   x = 4/5   ANSWER:4/5
<result>C</result>
The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is: