Question
PSLE
Zoe had a bag of black balls and pink balls in the ratio 18 : 7. She removed an equal number of black balls and pink balls from the bag. The ratio of the number of black balls and pink balls left in the bag became 9 : 1. What percentage of the balls were left in the bag?
2 m

Click button first when a symbol is required. X

PSLE
Zoe had a bag of black balls and pink balls in the ratio 18 : 7. She removed an equal number of black balls and pink balls from the bag. The ratio of the number of black balls and pink balls left in the bag became 9 : 1. What percentage of the balls were left in the bag?