SOLUTION: how many tablespoons of pure butter would need to be mixed with 60 tablespoons of a 50% butter spread to get a 70% butter spread

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Question 725806: how many tablespoons of pure butter would need to be mixed with 60 tablespoons of a 50% butter spread to get a 70% butter spread
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.5*60+x= .7(60+x)
30+x=42+.7x
.3x=12
3x=120
x=40