Question
PSLE
A bag contains erasers of three different colours. 18 of the erasers are yellow. The ratio of the number of blue erasers to that of orange erasers is 2 : 1. What is the ratio of the number of blue erasers to that of yellow erasers?
2 m

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PSLE
A bag contains erasers of three different colours. 18 of the erasers are yellow. The ratio of the number of blue erasers to that of orange erasers is 2 : 1. What is the ratio of the number of blue erasers to that of yellow erasers?