Solution
$$\frac{a}{b} = \frac{2}{3}$$
$$\frac{b}{c} = \frac{4}{5}$$
$$\frac{c}{d} = \frac{6}{7}$$
Multiplying all the equations, we get :
=> $$\frac{a}{b} * \frac{b}{c} * \frac{c}{d} = \frac{2}{3} * \frac{4}{5} * \frac{6}{7}$$
=> $$\frac{a}{d} = \frac{16}{35}$$
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