This is just the Iraq-Iran War on steroids. Two countries absolutely butchering their youth in a vainglorious attempt to claim hegemony over a minefield.
What are you even talking about?
There are no "two countries butchering". There is no symmetry.
There is a bandit state which invaded their neighbour (like many other neighbours they invaded before) and are murdering civilians, commiting war crimes and kidnapping children.
Sippenhaft or Sippenhaftung is a German term for the idea that a family or clan shares the responsibility for a crime or act committed by one of its members, justifying collective punishment. (...)
It was adopted by Nazi Germany to justify the punishment of kin (relatives, spouse) for the offence of a family member.
It is entirely possible and his answer was correct. Question was phrased incorrectly, if the teacher wanted an answer "it is not possible" he should have said both pizzas were the same size.
What... How... What?