Question
PSLE
At first, a box contained 4 black beads and some red beads. After some black beads were added, 38 of the beads were red. After 42 green beads were added to the box and now, 311 of the beads were red. What was the number of black beads added?
2 m

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PSLE
At first, a box contained 4 black beads and some red beads. After some black beads were added, 38 of the beads were red. After 42 green beads were added to the box and now, 311 of the beads were red. What was the number of black beads added?