Question
A box contains some pink, purple and grey mochi balls. The ratio of the number of pink mochi balls to the number of purple mochi balls is 7 : 2. The ratio of the number of purple mochi balls to the number of grey mochi balls is also 7 : 2. What is the ratio of the number of pink mochi balls to the number of grey mochi balls in the box?
2 m

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A box contains some pink, purple and grey mochi balls. The ratio of the number of pink mochi balls to the number of purple mochi balls is 7 : 2. The ratio of the number of purple mochi balls to the number of grey mochi balls is also 7 : 2. What is the ratio of the number of pink mochi balls to the number of grey mochi balls in the box?