book Maths Puzzle Numerical Ability

i need help solving this equation: r(R1+R2)=R1R2,for R

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At Bart's Discount Mart, the prices depend only on the name of the artist. If 2 Renoirs, 4 Rousseaus, and 1 Rembrandt cost $350, and 4 Renoirs, 6 Rousseaus, and 3 Rembrandts cost $ each edge of the cube is 3cm.What is the volume of the cube?(the possibilites are....6cm., 9cm., 27cm., or none of these)