Question
PSLE
A box contained yellow balls and red balls. 70% of the balls were red. After some grey balls were added to the box, 28% of the balls were red. What percentage of the balls in the box were grey?
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PSLE
A box contained yellow balls and red balls. 70% of the balls were red. After some grey balls were added to the box, 28% of the balls were red. What percentage of the balls in the box were grey?