47 the image says both triangles are similar so all you have to do is take the two angles add them than subtract it by the total of a triangle 180 and you get your answer 47
I believe it is 4 to make it able to divide by both sides
Answer=10%
15+2+3=20
2 of which are blue.
Put it over 100, 20x5=100 so 2x5=10