Question
PSLE
At first, a container contained 77 yellow balls and some purple beads. After some yellow balls were removed, 310 of the balls were purple. After 12 gold balls were added to the container and now, 314 of the beads were purple. What was the number of yellow balls removed?
2 m

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PSLE
At first, a container contained 77 yellow balls and some purple beads. After some yellow balls were removed, 310 of the balls were purple. After 12 gold balls were added to the container and now, 314 of the beads were purple. What was the number of yellow balls removed?