SOLUTION: Tin that was 48% pure was melted together with tin that was 44% pure to make 20 kilograms of an alloy that was 45% pure. How many kilograms of each were used? How do you set it up?

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Question 27794: Tin that was 48% pure was melted together with tin that was 44% pure to make 20 kilograms of an alloy that was 45% pure. How many kilograms of each were used? How do you set it up?
Answer by Paul(988) About Me  (Show Source):
You can put this solution on YOUR website!
0.48x+0.44(20-x)=0.45(20)
0.48+8.8-0.44x=9
0.04x=0.2
x=5

20-5=15

Hence, for 48% about 5 kg was used and for 44% about 15 kg was used.
Paul.