Mike has $$160$$ grams of a $$3\textbackslash\%$$ salt solution and Danni has an $$8\textbackslash\%$$ salt solution. If Danni gives $$200$$ grams of her solution to Mike, they will have the same amount of pure salt in their solutions. How many grams of solution did Danni have in the beginning? 
Overseas Competition->Knowledge Point->Word Problem Modules->Concentration Problems
$$160\times3\textbackslash\%+200\times8\textbackslash\%=20.8$$ ounces.  $$20.8\div8\textbackslash\%+200=260+200=460$$ ounces. 