question_text: How many days after the Soviet 11th Red Army's invasion of the First Republic of Armenia started did the actual transfer of power take place in Yerevan?
decomposition: return the   day when  the Soviet 11th Red Army 's invasion of   the  First Republic of Armenia started ;return the   day when  the actual transfer of   power take place in  Yerevan ;return the   difference of   #2 and  #1