Question
PSLE
At first, a box contained 11 yellow balls and some brown beads. After some yellow balls were added, 35 of the balls were brown. After 85 purple balls were added to the box and now, 310 of the beads were brown. What was the number of yellow balls added?
2 m

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PSLE
At first, a box contained 11 yellow balls and some brown beads. After some yellow balls were added, 35 of the balls were brown. After 85 purple balls were added to the box and now, 310 of the beads were brown. What was the number of yellow balls added?