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Question 8

Two numbers $$a$$ and $$b$$ are respectively $$20\%$$ and $$50\%$$ more of a third number $$c$$. The percentage of $$a$$ to $$b$$ is

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Here $$a = 1.2c$$ and $$b = 1.5c$$, so $$\frac{a}{b} = \frac{1.2c}{1.5c} = \frac{4}{5} = 0.8$$. As a percentage this is 80 %.

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