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Three storage tanks A, B and C had a total of 8750 litres of sulphuric acid.
A chemist used up `3/7`of the acid from tank A. Another chemist added 350 litres of acid into tank B and tripled the quantity of acid in tank C.
Then, the ratio of the quantity of acid in tanks A, B and C became 2:1:6.
How much more acid was there in tank C than tank B at first?