Question
PSLE
A box contained black marbles and red marbles. 30% of the marbles were red. After some green marbles were added to the box, 15% of the marbles were red. What percentage of the marbles in the box were green?
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PSLE
A box contained black marbles and red marbles. 30% of the marbles were red. After some green marbles were added to the box, 15% of the marbles were red. What percentage of the marbles in the box were green?