book Maths Puzzle Numerical Ability

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 $

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In A.D. 1054, Chinese astronomers observed a light from a supernova in the night sky. This supernova was the incredibly powerful origin of what is now the Crab Nebula. i need help solving this equation: r(R1+R2)=R1R2,for R