Question
PSLE
A box contained black marbles and white marbles. 70% of the marbles were white. After some red marbles were added to the box, 42% of the marbles were white. What percentage of the marbles in the box were red?
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PSLE
A box contained black marbles and white marbles. 70% of the marbles were white. After some red marbles were added to the box, 42% of the marbles were white. What percentage of the marbles in the box were red?