Question
PSLE
A box contained blue marbles and black marbles. 70% of the marbles were black. After some purple marbles were added to the box, 63% of the marbles were black. What percentage of the marbles in the box were purple?
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PSLE
A box contained blue marbles and black marbles. 70% of the marbles were black. After some purple marbles were added to the box, 63% of the marbles were black. What percentage of the marbles in the box were purple?