Question
There were 479 green, blue and red balls in a packet. Given that there were 128 more green balls than red balls and 72 more blue balls than red balls, how many red balls were there in the packet?
4 m

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There were 479 green, blue and red balls in a packet. Given that there were 128 more green balls than red balls and 72 more blue balls than red balls, how many red balls were there in the packet?