Initially marked 100 pieces,
This means that there are always 100 marked in the pond.
There are x fish in all.
Because the newly caught 200 fish represent the whole fish pond,
Therefore, 100: x = 20: 200.
The solution is X= 1000.
The quality is average.
100184kg,
200 pieces are 4 16kg, so 100 pieces are 208kg.
Average, (184+208)/2 = 196kg.
1.96kg each.
1000 x 1.96 = 1960kg。
That's all ~