The number 64 has the property that it is divisible by its units digit. How many whole numbers between 10 and 50 have this property?
Twelve numbers ending with 1, 2, or 5 have this property. They are 11, 12, 15, 21, 22, 25, 31, 32, 35, 41, 42, and 45. In addition, we have 33, 24, 44, 36, and 48, for a total of $\boxed{17}$. (Note that 20, 30, and 40 are not divisible by 0, since division by 0 is not defined.)