There are some marbles in a box. 1/3 of the marbles were black, while the rest are white and grey, the ratio of white marble to grey marble was 4:5. When 30 black marbles were exchanged for 30 white marbles, the new ratio of black marbles to white marbles to grey marbles became 6:11:10. How many black marbles were left after 20% of black marbles were taken out?

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