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After the game, Owen is thirsty again. This time he gets a mixture of 3 liters of juice, which contain $25 \textbackslash\%$ of apple juice, $30 \textbackslash\%$ of mango juice, and $45 \textbackslash\%$ of water. $0.5$ liters of mango is added to the original mixture. What is the percent of mango in the new mixture? (Adapted from 2007 AMC 8, Question \#17 ) 
Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Fractions and Percentages->Percentages Word Problems
Since $30 \textbackslash\%$ of the original 30 liters of paint was yellow, and 5 liters of yellow paint were added to make the new mixture, there are $9+5=14$ liters of yellow tint in the new mixture. Since only 5 liters of paint were added to the original 30 , there are a total of 35 liters of paint in the new mixture. This gives $40 \textbackslash\%$ of yellow tint in the new mixture, which is (C) 40 . 