Bronze, tin and copper

Bronze is an alloy of tin and copper. An alloy of 10% tin and 90% copper is Gunmetal. If it contains 20% tin and 80% copper, it is bell metal. How many tons of molten bell metal and how many tons of copper is needed to make 100 tons of Gunmetal?

Correct result:

z =  50 t
c =  50 t


m=100 a=m 10/100=100 10/100=10 t b=m 90/100=100 90/100=90 t z 20/100=a z=a/0.20=10/0.20=50 t
c=mz=10050=50 t

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