Question
PSLE
David kept his black and silver balls in two boxes. The ratio of the number of black to silver balls in the first box was 1 : 2 and it was 1 : 5 in the second box. The two boxes contained the same number of balls. What fraction of David's balls were black balls?
2 m

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PSLE
David kept his black and silver balls in two boxes. The ratio of the number of black to silver balls in the first box was 1 : 2 and it was 1 : 5 in the second box. The two boxes contained the same number of balls. What fraction of David's balls were black balls?