Problem 20 (1994 AJHSME)

Let $W$, $X$, $Y$ and $Z$ be four different digits selected from the set $\{1, 2, 3, 4, 5, 6, 7, 8, 9\}$. If the sum $\frac{W}{X}+\frac{Y}{Z}$ is to be as small as possible, then $\frac{W}{X}+\frac{Y}{Z}$ must equal