Question
PSLE
A box contained pink marbles and silver marbles. 70% of the marbles were silver. After some black marbles were added to the box, 28% of the marbles were silver. What percentage of the marbles in the box were black?
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PSLE
A box contained pink marbles and silver marbles. 70% of the marbles were silver. After some black marbles were added to the box, 28% of the marbles were silver. What percentage of the marbles in the box were black?