If 3A = 7B = 13C, then A : B : C is equal to
Let $$3A = 7B = 13C = k$$
=> $$A = \frac{k}{3}$$ , $$B = \frac{k}{7}$$ , $$C = \frac{k}{13}$$
=> Ratio of A : B : C = $$\frac{k}{3} : \frac{k}{7} : \frac{k}{13}$$
= $$\frac{1}{3}$$ : $$\frac{1}{7}$$ : $$\frac{1}{13}$$
L.C.M. of 3,7 and 13 = 273, thus multiplying by 273, we get :
= $$\frac{273}{3} : \frac{273}{7} : \frac{273}{13}$$
= 91 : 39 : 21
=> Ans - (D)
Create a FREE account and get:
