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Two stars of mass M and 2M, a distance 3x apart rotates in circles about the common center mass "0" The gravitational force acting on the stars is KGM^2/x^2, what is value of K?

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G(M)(2M)/(3x)^2 = KGM^2/x^2
2GM^2/9x^2 = KGM^2/x^2
2/9 = K

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