Question
PSLE
A box contains blue, red and black marbles. 211 of the marbles are blue. 13 of the remaining marbles are red. What fraction of the marbles in the box are black?
2 m

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PSLE
A box contains blue, red and black marbles. 211 of the marbles are blue. 13 of the remaining marbles are red. What fraction of the marbles in the box are black?