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