Greatest possible integer value of x+y? I found a interesting question in one exam.
If 5 <  x < 10 and y = x + 5, what is the greatest possible integer value of x + y ?
(A) 18
(B) 20
(C) 23
(D) 24
(E) 25

MySol:  For max value of x+y , x should be 9.
 So x+y =  9+14 = 23
But this is not correct. 
Can someone explain.

$x+y = x+x+5 = 2x + 5$ and since $5<x<10$, we have $15<2x+5<25$.
