If 4<x<6<y<10, then what is the greatest possible positive integer difference of x and y?
Choose the correct choice
A) 3  B) 4  C) 5  D) 6  E) 7

Rationale: "4 < x < 6 < y < 10 ; 4 < x y < 10 4 + y < x + 10 y - x < 6 . positive integer difference is 5 ( for example y = 9.5 and x = 4.5 ) answer : c ."
Answer: C