Question
PSLE
Erika had a box of grey marbles and blue marbles in the ratio 16 : 9. She removed an equal number of grey marbles and blue marbles from the box. The ratio of the number of grey marbles and blue marbles left in the box became 9 : 1. What percentage of the marbles were left in the box?
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PSLE
Erika had a box of grey marbles and blue marbles in the ratio 16 : 9. She removed an equal number of grey marbles and blue marbles from the box. The ratio of the number of grey marbles and blue marbles left in the box became 9 : 1. What percentage of the marbles were left in the box?