Question
PSLE
At first, a box contained 50 purple marbles and some blue beads. After some purple marbles were removed, 57 of the marbles were blue. After 16 black marbles were added to the box and now, 511 of the beads were blue. What was the number of purple marbles removed?
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PSLE
At first, a box contained 50 purple marbles and some blue beads. After some purple marbles were removed, 57 of the marbles were blue. After 16 black marbles were added to the box and now, 511 of the beads were blue. What was the number of purple marbles removed?