其它
Suppose $20 \textbackslash\%$ of $x$ equals $40\textbackslash\%$ of $y$. What percentage of $y$ is $x$ ? (adapted from 2020 AMC 8, Question 15) 
Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Fractions and Percentages->Percentages Word Problems
$20 \textbackslash\% \cdot x = 40\textbackslash\% \cdot y$  $ x = 2 \cdot y$ 