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Mathematical problems-general survey and spot check
The survival rate is 95%, which means there are 95,000 pieces, surviving.

The average weight of each fish salvaged for the first time is 2.5 kilograms.

The average weight of each fish salvaged for the second time was 2.2 kg.

The average weight of each fish salvaged for the third time was 2.8 kg.

The average weight of each fish in the fish pond is 2.5+2.2+2.8/3=2.5 kg.

Then the total weight of fish in the fish pond is: 2.5*95000=2375000 kg (2375 tons