Question
PSLE
A box contained black balls and gold balls. 40% of the balls were gold. After some grey balls were added to the box, 20% of the balls were gold. What percentage of the balls in the box were grey?
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PSLE
A box contained black balls and gold balls. 40% of the balls were gold. After some grey balls were added to the box, 20% of the balls were gold. What percentage of the balls in the box were grey?