Question
PSLE
A box contained grey marbles and blue marbles. 60% of the marbles were blue. After some red marbles were added to the box, 18% of the marbles were blue. What percentage of the marbles in the box were red?
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PSLE
A box contained grey marbles and blue marbles. 60% of the marbles were blue. After some red marbles were added to the box, 18% of the marbles were blue. What percentage of the marbles in the box were red?