if 4 < x < 6 < y < 10 , then what is the greatest possible positive integer difference of x and y ?
"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 ."
subtract(subtract(10, 4), const_1)