Question
PSLE
A box contained silver marbles and blue marbles. 70% of the marbles were blue. After some green marbles were added to the box, 21% of the marbles were blue. What percentage of the marbles in the box were green?
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PSLE
A box contained silver marbles and blue marbles. 70% of the marbles were blue. After some green marbles were added to the box, 21% of the marbles were blue. What percentage of the marbles in the box were green?