Question
PSLE
At first, a box contained 8 yellow balls and some green beads. After some yellow balls were added, 35 of the balls were green. After 30 brown balls were added to the box and now, 37 of the beads were green. What was the number of yellow balls added?
2 m

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PSLE
At first, a box contained 8 yellow balls and some green beads. After some yellow balls were added, 35 of the balls were green. After 30 brown balls were added to the box and now, 37 of the beads were green. What was the number of yellow balls added?