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The precision of integers with trailing zeros is ambiguous. The precision of 20400 litres can be 1, 10 or 100.

Corresponding to these values, the greatest possible errors can be 0.5L, 5L or 50L.

Actually, the precision could even be 20400L, in which case the maximum possible error is 10200L. If, for example, you had tanks of 20400L each, you might simply know how many tanks' worth you had - precision to 20400L. Unlikely, though.

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Q: What is the precision and the greatest possible error of 20400L?
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