Question
PSLE
At first, a box contained 7 grey beads and some gold beads. After some grey beads were added, 58 of the beads were gold. After 78 silver beads were added to the box and now, 514 of the beads were gold. What was the number of grey beads added?
2 m

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PSLE
At first, a box contained 7 grey beads and some gold beads. After some grey beads were added, 58 of the beads were gold. After 78 silver beads were added to the box and now, 514 of the beads were gold. What was the number of grey beads added?