<PRE><B>Question 1167249</B>
Those are  €40  per gram and  €0.800 per gram.
Want 20 grams of  €15  per gram alloy.


If m is mass of the  €40  per gram Gold, then 20-m is how much of the  €0.8  per gram Silver to use.


{{{highlight_green(40m+0.8(20-m)=15*20)}}}





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