Question
PSLE
A box contained yellow balls and black balls. 60% of the balls were black. After some red balls were added to the box, 48% of the balls were black. What percentage of the balls in the box were red?
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PSLE
A box contained yellow balls and black balls. 60% of the balls were black. After some red balls were added to the box, 48% of the balls were black. What percentage of the balls in the box were red?