ACT 2020 July(C01) Math Question 17 Explanation - ACT Helper

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2020 July(C01) Math Question 17
Statistics
- Mean, Median
Choice C
$\frac{46 + x}{60 + x} = 0.8$ $\Rightarrow 0.8 \times (60 + x) = 46 + x$ $\Rightarrow 48 + 0.8 x = 46 + x$ $\Rightarrow 0.2 x = 2$ $\Rightarrow x = 10$
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