Q: 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: After their failure to secure the control of government in Georgia following the Russian Revolution of 1917, most of the Bolshevik Georgian leaders relocated to Soviet Russia, from where they guided underground activities aimed at undermining the Menshevik-dominated government in Tiflis. A series of attempts to lead a peasant revolution against the Mensheviks were rendered abortive from 1918 to 1919, but preparations for a larger-scale revolt had been set in motion. The overthrow of the Democratic Republic of Azerbaijan by the Red Army in April 1920 created a precedent for the Bolsheviks in Georgia. Georgia had been in a defense alliance with Azerbaijan since 1919, but the Menshevik government hesitated to get involved in the conflict. In his April 30 speech, Georgian Premier Noe Zhordania stated that his country had been prepared to come to aid to Azerbaijan provided that the latter's own people fought for their independence. But as the Reds met minimal resistance in Baku, the Georgian government chose not to, a decision that was heavily criticized by the opposition. In conclusion, Zhordania declared that Georgia, if attacked, would defend its independence.
A:
How many years after the Russian Revolution did the Red Army overthrow the Democratic Republic of Azerbaijan?