$$O$$ is a point inside an equilateral triangle $$ABC$$. The perpendicular distances $$OP,OQ,OR$$ to the sides of the triangle are in the ratio $$OP:OQ:OR=1:2:3$$. If $$\frac{\text{Area of triangle }OPBR}{\text{Area of quadrilateral }ABC}=\frac{a}{b}$$, where $$a,b$$ are co-prime positive integers, then $$a+b$$ equals