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Let $$5A = 13B = 7C = k$$
=> $$A = \frac{k}{5}$$ , $$B = \frac{k}{13}$$ , $$C = \frac{k}{7}$$
=> Ratio of A : B : C = $$\frac{k}{5} : \frac{k}{13} : \frac{k}{7}$$
= $$\frac{1}{5}$$ : $$\frac{1}{13}$$ : $$\frac{1}{7}$$
L.C.M. of 5,13 and 7 = 455, thus multiplying by 455, we get :
= $$\frac{455}{5} : \frac{455}{13} : \frac{455}{7}$$
= 91 : 35 : 65
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