Question
PSLE
A bag contains erasers of three different colours. 15 of the erasers are yellow. The ratio of the number of red erasers to that of orange erasers is 2 : 5. What is the ratio of the number of yellow erasers to that of orange erasers?
2 m

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PSLE
A bag contains erasers of three different colours. 15 of the erasers are yellow. The ratio of the number of red erasers to that of orange erasers is 2 : 5. What is the ratio of the number of yellow erasers to that of orange erasers?