#16 – Siblings
Arda and Berna are siblings. Arda has 5 times as many sisters as brothers. If one of his sisters had been a boy, Berna would have an equal number of brothers and sisters. How many siblings are there? How many of them are male? How many are female?
The Prize for This Question: Rubik’s 3×3 Cube
This question was prepared by Emrehan Halıcı, president of the Turkey Intelligence Foundation, for Bilkent IEEE.