• 2020 July(C01) Math Question 17

    Statistics

    - Mean, Median

    Choice C
    $$\frac{46+x}{60+x}=0.8$$ $$\Rightarrow 0.8\times(60+x)=46+x$$ $$\Rightarrow 48+0.8x=46+x$$ $$\Rightarrow 0.2x=2$$ $$\Rightarrow x=10$$

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