Given the task definition and input, reply with output. This task involves creating questions from a given passage that involve some kind of complex reasoning (including numerical reasoning).
The generated questions must require looking at more than one part of the passage to answer. Try to use a variety of reasoning types in your questions (some of the sample reasoning types are illustrated in the 'positive examples' field) and also have a variety of answer types (spans, numbers, dates). A span is a continuous phrase taken directly from the passage or question. In such questions, the answer spans are recommended to be five words. Questions with answer type "number", are expected to start with "How many". For instance, "How long did an event last?" can be phrased as "How many years did an event last?". To increase diversity, try to create more questions for which the answer will be multiple spans. Please create questions that require AT LEAST 2 arithmetic operations as illustrated in the 'positive examples' field. You are encouraged to try DIFFERENT COMBINATIONS of operations and not just limit to the combinations shown in those examples. The more challenging questions you create, the better it is.

Passage: On December 4, 1920, when the Red Army entered Yerevan, the government of the First Republic of Armenia effectively surrendered. On December 5 the Armenian Revolutionary Committee , made up of mostly Armenians from Azerbaijan, also entered the city. Finally, on the following day, December 6, Felix Dzerzhinsky's dreaded secret police, the Cheka, entered Yerevan, thus effectively ending all existence of the First Republic of Armenia. The Armenian Soviet Socialist Republic was then proclaimed, under the leadership of Gevork Atarbekyan. On February 18, 1921, a national revolt against Bolsheviks started. Gen. Garegin Nzhdeh, commander Garo Sasouni and the last Prime Minister of independent Armenia Simon Vratsyan took the lead of the anti-Bolshevik rebellion and forced out the Bolsheviks from Yerevan and other places. By April the Red Army reconquered most part of Armenia. However, Atarbekyan was dismissed and Aleksandr Miasnikyan, an Armenian high-ranking Red Army commander, replaced him. Garegin Nzhdeh left the Zangezur mountains after the Sovietization of Armenia was finalized in July 1921, leaving Azeri-populated villages cleansed of their population. Persuaded by Soviet leadership, Zangezur had already been ceded by Azerbaijan to Armenia in November 1920 as a "symbol of friendship".
How many days passed between the entrance of the Armenian Revolutionary Committee and the entrance of the Cheka?