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Patrick gets $80 \textbackslash\%$ on a 10 -problem test, $60 \textbackslash\%$ on a 20 -problem test and $50 \textbackslash\%$ on a 30 -problem test. If the three tests are combined into one 60 problem test, which percent is closest to her overall score? (adapted from 2006 AMC 8, Question \#12) 
Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Fractions and Percentages->Percentages Word Problems
$80 \textbackslash\% \cdot 10=8$, $60\textbackslash\% \cdot 20=12$, $50\textbackslash\% \cdot 30=15$  Adding them up gets $8+12+15=35$. The overall percentage correct would be $\frac{35}{60} \approx 0.58$. 