Question
PSLE
A bag contains erasers of three different colours. 19 of the erasers are purple. The ratio of the number of yellow erasers to that of blue erasers is 1 : 2. What is the ratio of the number of purple erasers to that of blue erasers?
2 m

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PSLE
A bag contains erasers of three different colours. 19 of the erasers are purple. The ratio of the number of yellow erasers to that of blue erasers is 1 : 2. What is the ratio of the number of purple erasers to that of blue erasers?