Sand in the warehouse
Several tonnes of sand were delivered to a building materials warehouse in the morning. The first customer, Adamík, took away five sixths of it. The second customer, Bílý, bought two thirds of the remainder, and the last customer, Certis, took away three fifths of what was left. In the evening, 80 kg of sand remained in the warehouse. How many tonnes of sand were in the warehouse in the morning? How many kilograms of sand did each customer buy?
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