Question
If $$\frac{a}{b} = \frac{4}{5}$$ and $$\frac{b}{c} = \frac{{15}}{{16}}{\text{,}}$$ then $$\frac{{18{c^2} - 7{a^2}}}{{45{c^2} + 20{a^2}}}$$ is equal to?
Answer: Option D
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