A Roman Puzzle
Can you solve this?
One noble Roman dictated a will on his deathbed requesting to split his possessions between his pregnant wife and the unborn child in the following way. If the child is a boy, he should get 2/3 of the total amount, leaving 1/3 to the wife. If the child is a girl, she should get 1/3, leaving 2/3 to the wife. The nobleman died and a few months later his wife gave birth to twins: a boy and a girl. The smartest men and women of the empire were called to resolve the inheritance dispute. One of them - Stevenus Goodmanus - came up with a solution and a proof that it follows the will as closely as possible. What is this solution?