Question
A box contains some purple, grey and brown mini cupcakes. The ratio of the number of purple mini cupcakes to the number of grey mini cupcakes is 9 : 10. The ratio of the number of grey mini cupcakes to the number of brown mini cupcakes is also 9 : 10. What is the ratio of the number of purple mini cupcakes to the number of brown mini cupcakes in the box?
2 m

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A box contains some purple, grey and brown mini cupcakes. The ratio of the number of purple mini cupcakes to the number of grey mini cupcakes is 9 : 10. The ratio of the number of grey mini cupcakes to the number of brown mini cupcakes is also 9 : 10. What is the ratio of the number of purple mini cupcakes to the number of brown mini cupcakes in the box?