Question
PSLE
A box contains red, black and yellow marbles. 13 of the marbles are red. 25 of the remaining marbles are black. What fraction of the marbles in the box are yellow?
2 m

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PSLE
A box contains red, black and yellow marbles. 13 of the marbles are red. 25 of the remaining marbles are black. What fraction of the marbles in the box are yellow?