Question
There were 405 blue, green and orange marbles in a bag. Given that there were 120 more blue marbles than orange marbles and 60 more green marbles than orange marbles, how many orange marbles were there in the bag?
4 m

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There were 405 blue, green and orange marbles in a bag. Given that there were 120 more blue marbles than orange marbles and 60 more green marbles than orange marbles, how many orange marbles were there in the bag?