10. In a coach of a train there are 72 seats numbered from 1 to 72 in groups of 8, as follows. 16 15 13 10 12 9 11 6 The sum of all the composite seat numbers which are opposite to seat numbers that are multiples of 10, will be. Every 7th seat is exactly opposite to 8th seat. Every 3rd seat is exactly opposite to 6th seat. Every 2nd seat is exactly opposite to 5th seat. Every 1 seat is exactly opposite to 4th seat. In every group,
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