Question
PSLE
At first, a box contained 70 green marbles and some gold beads. After some green marbles were removed, 35 of the marbles were gold. After 20 brown marbles were added to the box and now, 37 of the beads were gold. What was the number of green marbles removed?
2 m

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PSLE
At first, a box contained 70 green marbles and some gold beads. After some green marbles were removed, 35 of the marbles were gold. After 20 brown marbles were added to the box and now, 37 of the beads were gold. What was the number of green marbles removed?