A woman has five bags. Four are empty and one is full. The puzzle asks how all five bags can still be heavy. At first, “empty” seems to mean those four bags should weigh almost nothing, but there is a simple arrangement that solves the contradiction.
Answer: The four empty bags are inside the one full bag.
The four bags are empty because they contain nothing themselves, while the fifth bag is full because it contains those four bags. When she carries the full outer bag, she is effectively carrying the weight of all five bags together.
It is a classic logic riddle that depends on interpreting “empty” correctly: an empty bag still has its own weight.
