To use this simulation of 3 & 8 oz. cups, drag either cup on top of the spigot,
the funnel, or the other cup.
Hint: make sure your cursor overlaps with the target object (spigot, funnel, or
cup) before you release the mouse button.
The numbers at the bottom record the amounts you've measured.
Even numbers appear in green.
Odd numbers appear in orange.
Amounts you haven't measured before are underlined.