WAEC - Mathematics (2002 - No. 7)

Find the value of x in the diagram

31^o

35^o

37^o

41^o

Sum of exterior angle of any polygon is 360^o
(2x+5)^o + 2x^o + (x-20)^o + x^o + (3x+10)^o + (x + 15)^o = 360^o; 10x = 350
x = 35