The monthly distribution of 9 Watt bulbs sold by two firms X and Y from January to June 2018 is shown in the pie-chart and corresponding table. If the total number of LED bulbs sold by two firms during April – June 2018 is 50000, then the number of LED bulbs sold by the firm Y during April – June 2018 is _____

Month	The ratio of LED bulbs sold by two firms (X : Y)
January	7 : 8
February	2 : 3
March	2 : 1
April	3 : 2
May	1 : 4
June	9 : 11