If 3/p=8 & 3/q=18 then p-q=?  Choose the correct choice from the following options
A) 5 / 24 B) 6 / 24 C) 7 / 24 D) 8 / 24 E) 9 / 24

Rationale: "p = 3 / 8 , q = 3 / 18 = > q = 1 / 6 therefore p - q = ( 3 / 8 ) - ( 1 / 6 ) = 5 / 24 answer : a"
Answer: A