Question
PSLE
A box contained purple balls and silver balls. 30% of the balls were silver. After some yellow balls were added to the box, 21% of the balls were silver. What percentage of the balls in the box were yellow?
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PSLE
A box contained purple balls and silver balls. 30% of the balls were silver. After some yellow balls were added to the box, 21% of the balls were silver. What percentage of the balls in the box were yellow?