Question
PSLE
A box contained grey beads and silver beads. 40% of the beads were silver. After some black beads were added to the box, 20% of the beads were silver. What percentage of the beads in the box were black?
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PSLE
A box contained grey beads and silver beads. 40% of the beads were silver. After some black beads were added to the box, 20% of the beads were silver. What percentage of the beads in the box were black?