What is the maximum value, in dollars, of the rocks he can carry out of the cave? While exploring a cave, Carl comes across a collection of -pound rocks worth each, -pound rocks worth each, and -pound rocks worth each. How many of the blue balls must be removed so that the percentage of red balls in the urn will be ? (No red balls are to be removed.)
A large urn contains balls, of which are red and the rest are blue.
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