A bird has a head 9 cm long. The tail is equal to the size of the head plus half of the size of the body. The body is the size of the head plus the tail.
72cm. The head is 9cm. The tail is 18 + 9= 27cm. The body is 9 + 18 + 9= 36cm. 9 + 27 + 36= 72cm.