How many chief executives serve at the same time?

Question

how many?

Answer 1

None of the Chief of the Chief Executives serve at the same time because there can be only 1 chief.

Reason : 1 President of the Countries or 1 Prime Minister of the Countries and also 1 sub President or 1 sub PM except my country has 1 President, 2 senior mentors, one PM and 3 sub PM. lol. 2 tigers cannot live under one mountain! Many tigers live together cannot survive well.

E.g. Microsoft - Bills Gates - only 1.

E.g. Yahoo - Jerry - only 1.

E.g. USA - Bush - only 1.