Question
PSLE
Tina had a box of yellow balls and silver balls in the ratio 13 : 7. She removed an equal number of yellow balls and silver balls from the box. The ratio of the number of yellow balls and silver balls left in the box became 7 : 2. What percentage of the balls were left in the box?
2 m

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PSLE
Tina had a box of yellow balls and silver balls in the ratio 13 : 7. She removed an equal number of yellow balls and silver balls from the box. The ratio of the number of yellow balls and silver balls left in the box became 7 : 2. What percentage of the balls were left in the box?