Question
PSLE
At first, a box contained 72 blue balls and some purple beads. After some blue balls were removed, 47 of the balls were purple. After 12 grey balls were added to the box and now, 413 of the beads were purple. What was the number of blue balls removed?
2 m

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PSLE
At first, a box contained 72 blue balls and some purple beads. After some blue balls were removed, 47 of the balls were purple. After 12 grey balls were added to the box and now, 413 of the beads were purple. What was the number of blue balls removed?