There was a bridge, and the maximum weight the bridge held per car/truck was 1 tonne.

There was a truck that weighed 999.99kg and went on the bridge. When the truck got half way a bird weighing 20g sat on the truck.
Why didn't the bridge break?

By the time the truck got half way it would have all ready lost more than 20g of petrol.
1 Tonne Bridge Riddle Meme.
1 Tonne Bridge Riddle Meme with riddle and answer page link.
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