Question
PSLE
At first, a box contained 4 brown marbles and some purple beads. After some brown marbles were added, 57 of the marbles were purple. After 36 black marbles were added to the box and now, 59 of the beads were purple. What was the number of brown marbles added?
2 m

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PSLE
At first, a box contained 4 brown marbles and some purple beads. After some brown marbles were added, 57 of the marbles were purple. After 36 black marbles were added to the box and now, 59 of the beads were purple. What was the number of brown marbles added?