Question 1145206
Note that 18 karat is twice the concentration of 9 karat.


w grams of the 18 karat gold
600-w grams of the 9 karat gold


{{{18w+9(600-w)=15*600}}}

{{{2w+600-w=5*200}}}

{{{w=1000-600}}}

{{{highlight(w=400)}}}---------grams of the 18 karat gold

{{{200}}}---------------grams of the 9 karat gold