Question
A box contains some grey, brown and black mochi balls. The ratio of the number of grey mochi balls to the number of brown mochi balls is 6 : 5. The ratio of the number of brown mochi balls to the number of black mochi balls is also 6 : 5. What is the ratio of the number of grey mochi balls to the number of black mochi balls in the box?
2 m

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A box contains some grey, brown and black mochi balls. The ratio of the number of grey mochi balls to the number of brown mochi balls is 6 : 5. The ratio of the number of brown mochi balls to the number of black mochi balls is also 6 : 5. What is the ratio of the number of grey mochi balls to the number of black mochi balls in the box?