Question
PSLE
Penelope had a box of brown marbles and silver marbles in the ratio 17 : 7. She removed an equal number of brown marbles and silver marbles from the box. The ratio of the number of brown marbles and silver marbles left in the box became 7 : 2. What percentage of the marbles were left in the box?
2 m

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PSLE
Penelope had a box of brown marbles and silver marbles in the ratio 17 : 7. She removed an equal number of brown marbles and silver marbles from the box. The ratio of the number of brown marbles and silver marbles left in the box became 7 : 2. What percentage of the marbles were left in the box?