Question
PSLE
A box contained green balls and red balls. 60% of the balls were red. After some black balls were added to the box, 45% of the balls were red. What percentage of the balls in the box were black?
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PSLE
A box contained green balls and red balls. 60% of the balls were red. After some black balls were added to the box, 45% of the balls were red. What percentage of the balls in the box were black?