Sam wants to use two kinds of sugar water with concentrations of $$5\textbackslash\%$$ and $$20\textbackslash\%$$ to make a sugar water of $$300$$g with a concentration of $$15\textbackslash\%$$. He correctly calculated the required ratio of the two solutions, but reversed the two bottles of sugar water when preparing them. The actual concentration of the wrongly mixed sugar water is~\uline{~~~~~~~~~~}~$$\textbackslash\%$$. 
Overseas Competition->Knowledge Point->Word Problem Modules->Concentration Problems
NA 