Your question is Chocolate Bars Logic Puzzle. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You have 8 bars of chocolate, one is lighter. With only a classic scale of justice, can you figure out which bar is the lightest in (a) 3 moves, (b) 2 moves, and (c) one move?