Question
PSLE
At first, a box contained 99 red balls and some blue beads. After some red balls were removed, 57 of the balls were blue. After 55 pink balls were added to the box and now, 512 of the beads were blue. What was the number of red balls removed?
2 m

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PSLE
At first, a box contained 99 red balls and some blue beads. After some red balls were removed, 57 of the balls were blue. After 55 pink balls were added to the box and now, 512 of the beads were blue. What was the number of red balls removed?