Question
PSLE
At first, a box contained 7 blue beads and some gold beads. After some blue beads were added, 35 of the beads were gold. After 21 green beads were added to the box and now, 38 of the beads were gold. What was the number of blue beads added?
2 m

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PSLE
At first, a box contained 7 blue beads and some gold beads. After some blue beads were added, 35 of the beads were gold. After 21 green beads were added to the box and now, 38 of the beads were gold. What was the number of blue beads added?