AMC8 2020
AMC8 2020 · Q15
AMC8 2020 · Q15. It mainly tests Percent, Ratios & proportions.
Suppose $15\%$ of $x$ equals $20\%$ of $y.$ What percentage of $x$ is $y?$
假设 $x$ 的 15% 等于 $y$ 的 20%。$y$ 是 $x$ 的百分之多少?
(A)
5
5
(B)
35
35
(C)
75
75
(D)
133 \frac13
133 \frac13
(E)
300
300
Answer
Correct choice: (C)
正确答案:(C)
Solution
Since $20\% = \frac{1}{5}$, multiplying the given condition by $5$ shows that $y$ is $15 \cdot 5 = \boxed{\textbf{(C) }75}$ percent of $x$.
由于 $20\% = \frac{1}{5}$,将给定条件乘以 5 表明 $y$ 是 $x$ 的 $15 \cdot 5 = \boxed{\textbf{(C) }75}$ 百分比。
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