Question
PSLE
A box contained silver balls and black balls. 70% of the balls were black. After some purple balls were added to the box, 63% of the balls were black. What percentage of the balls in the box were purple?
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PSLE
A box contained silver balls and black balls. 70% of the balls were black. After some purple balls were added to the box, 63% of the balls were black. What percentage of the balls in the box were purple?