Question
PSLE
A box contained blue balls and grey balls. 70% of the balls were grey. After some yellow balls were added to the box, 49% of the balls were grey. What percentage of the balls in the box were yellow?
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PSLE
A box contained blue balls and grey balls. 70% of the balls were grey. After some yellow balls were added to the box, 49% of the balls were grey. What percentage of the balls in the box were yellow?