SOLUTION: how many cups of grapefruit juice must be added to 40 cups of punch that is 5% grapefruit juice to obtain a punch that is 10% gragefruit juice?

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Question 882528: how many cups of grapefruit juice must be added to 40 cups of punch that is 5% grapefruit juice to obtain a punch that is 10% gragefruit juice?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The problem fits this form: Mixture: one material quantity unknown and solution method is the same.