Question
PSLE
A box contained black marbles and red marbles. 60% of the marbles were red. After some purple marbles were added to the box, 42% of the marbles were red. What percentage of the marbles in the box were purple?
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PSLE
A box contained black marbles and red marbles. 60% of the marbles were red. After some purple marbles were added to the box, 42% of the marbles were red. What percentage of the marbles in the box were purple?