Question
PSLE
A box contained white marbles and pink marbles. 40% of the marbles were pink. After some black marbles were added to the box, 22% of the marbles were pink. What percentage of the marbles in the box were black?
2 m

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PSLE
A box contained white marbles and pink marbles. 40% of the marbles were pink. After some black marbles were added to the box, 22% of the marbles were pink. What percentage of the marbles in the box were black?