Question
PSLE
Lee kept his brown and black balls in two boxes. The ratio of the number of brown to black balls in the first box was 1 : 4 and it was 1 : 2 in the second box. The two boxes contained the same number of balls. What fraction of Lee's balls were black balls?
2 m

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PSLE
Lee kept his brown and black balls in two boxes. The ratio of the number of brown to black balls in the first box was 1 : 4 and it was 1 : 2 in the second box. The two boxes contained the same number of balls. What fraction of Lee's balls were black balls?