Twenty carvans are travelling across the desert one day apart. The first carvan
reached the oasis and the camels drank half of the water in the pool. On the second
day, the second carvan reached the oasis and the camels drank one – third of the
water that was left. On the third day, the camels in the third carvan drank one-
quarter of the water that was left. On the first day, the pool contained 1050 cubic
metres of water. How much water was left after the 20th carvan passed through?
Answer:
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