Question
PSLE
A box contained white balls and yellow balls. 40% of the balls were yellow. After some red balls were added to the box, 18% of the balls were yellow. What percentage of the balls in the box were red?
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PSLE
A box contained white balls and yellow balls. 40% of the balls were yellow. After some red balls were added to the box, 18% of the balls were yellow. What percentage of the balls in the box were red?