Question
A bag consisted of 180 purple, grey and brown balls. There were four times as many brown balls as grey balls, and 12 more grey balls than purple balls. How many grey balls were there in the bag?
4 m

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A bag consisted of 180 purple, grey and brown balls. There were four times as many brown balls as grey balls, and 12 more grey balls than purple balls. How many grey balls were there in the bag?