SOLUTION: How many kilograms of a 15% copper alloy must be melted with a 45% copper alloy to obtain 60 kilograms of a 32% copper alloy? I tried to do it this way: 0.45x-0.15x=.32(60), but

Question 511177: How many kilograms of a 15% copper alloy must be melted with a 45% copper alloy to obtain 60 kilograms of a 32% copper alloy?
I tried to do it this way: 0.45x-0.15x=.32(60), but it didn't work. I don't know how to do these kinds of problems. I don't know how to turn them into equations. Can somebody please help me? And can somebody show me how to do it the way that I just tried, with the decimals before them, please?
Answer by Maths68(1474) (Show Source): You can put this solution on YOUR website!
Two mistakes in your approach to solve this problem

1) When you take x kg of one alloy you must take (60-x)kg because we need 60 kg when we add x+(60-x) we will get 60 which is our requirement

2)We are adding both alloys but you subtract it!!!!

Now see what will be the equation
0.45x+0.15(60-x)=.32(60)
I hope you will solve the rest.

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