Question
PSLE
At first, a box contained 3 black balls and some white beads. After some black balls were added, 57 of the balls were white. After 108 pink balls were added to the box and now, 513 of the beads were white. What was the number of black balls added?
2 m

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PSLE
At first, a box contained 3 black balls and some white beads. After some black balls were added, 57 of the balls were white. After 108 pink balls were added to the box and now, 513 of the beads were white. What was the number of black balls added?