Question
PSLE
A box contained yellow balls and brown balls. 70% of the balls were brown. After some pink balls were added to the box, 21% of the balls were brown. What percentage of the balls in the box were pink?
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PSLE
A box contained yellow balls and brown balls. 70% of the balls were brown. After some pink balls were added to the box, 21% of the balls were brown. What percentage of the balls in the box were pink?