これが難しい謎です。女の子には姉妹と同じくらい多くの兄弟がいますが、兄弟には姉妹の半分しかいません。家族には何人の兄弟姉妹がいますか？
Here's a difficult riddle. A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?