HOW THEY STACK UP
FIVE NUMBER CUBES ARE STACKED ONE ON TOP OF THE OTHER. YOU MAY VIEW THE STACK FROM ANY SIDE. YOU MAY NOT LIFT OR MOVE ANY OF THE CUBES. THE TOP FACE SHOWS "3"
WHAT IS THE SUM OF THE FACES THAT ARE HIDDEN FORM VIEW?
HINT: OPPOSITE FACES OF THE CUBES ADD UP TO 7.
