find the reciprocal of 17/20? How would i work this problem?

Answer 1

http://www.mathsisfun.com/reciprocal-fraction.html

Answer 2

So i have this problem right here: "for all real numbers b and c such that the product of c and 3 is b, which of the following expression represents the sum of c and 3 in the terms of b ?"
options:
A) B + 3.
B) 3b + 3.
C) 3(b + 3).
D) b + 3/3 (b + 3 over 3 btw ).
E) b/3 + 3.
any suggestions ? help ??