Question
PSLE
A box contained purple marbles and grey marbles. 70% of the marbles were grey. After some white marbles were added to the box, 56% of the marbles were grey. What percentage of the marbles in the box were white?
2 m

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PSLE
A box contained purple marbles and grey marbles. 70% of the marbles were grey. After some white marbles were added to the box, 56% of the marbles were grey. What percentage of the marbles in the box were white?