A positive number when decreased by 4 is equal to 21 times the reciprocal of the number. The number is:	Choose the most appropriate option.
A) 2 B) 5 C) 9 D) 7 E) 6
Let the number be x   x-4=21/x   x^2 - 4x -21=0   (x-7)(x+3)=0   x=7   correct answer 7
<result>D</result>
A positive number when decreased by 4 is equal to 21 times the reciprocal of the number. The number is: