x varies inversely as square of y. Given that y=3 for x=1. The value of x for y = 9 will be equal to:
Choose the correct choice from the following choices.
A) 3  B) 6  C) 1 / 9  D) 1 / 3  E) 9

Rationale: "explanation : solution : given x = k / y ^ 2 , where k is constant . now , y = 3 and x = 1 gives k = 9 . . ' . x = 9 / y ^ 2 = > x = 9 / 9 ^ 2 = 1 / 9 answer : c"
Answer: C