SOLUTION: "How many cups of lemon juice must be added to a 20 cup punch bowl that is 15% lemon juice to make lemonade that is 30% lemon juice?"

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Question 804641: "How many cups of lemon juice must be added to a 20 cup punch bowl that is 15% lemon juice to make lemonade that is 30% lemon juice?"
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
"How many cups of lemon juice must be added to a 20 cup punch bowl that is 15% lemon juice to make lemonade that is 30% lemon juice?"
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Add x cups
20*15 + 100x = 30*(20 + x)