Question
PSLE
Kimberly had a basket of yellow balls and black balls in the ratio 13 : 7. She removed an equal number of yellow balls and black balls from the basket. The ratio of the number of yellow balls and black balls left in the basket became 9 : 4. What percentage of the balls were left in the basket?
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PSLE
Kimberly had a basket of yellow balls and black balls in the ratio 13 : 7. She removed an equal number of yellow balls and black balls from the basket. The ratio of the number of yellow balls and black balls left in the basket became 9 : 4. What percentage of the balls were left in the basket?