The riddle "A woman has 7 children. Half of them are boys. How can that be?" is a play on words and logic. Since 7 is an odd number, it cannot be split exactly in half. The key to the riddle is that "half of them are boys" does not necessarily mean exactly half, but rather at least half or about half. The only way for this statement to be true is if all 7 children are boys —then it is true that half (and more) are boys
. In other words, the phrase "half of them are boys" is used loosely or trickily, and the answer is that all the children are boys, so half of them being boys is trivially true.
