Originally, salt accounts for water =1÷ (5-1) =1/4.
Now salt accounts for water =1÷ (4-1) =1/3.
Water =16÷ (1/3-1/4) =192kg.
Salt = 192× 1/4 = 48kg.
Raw brine = 192+48=240 kg.
You can ask questions if you don't understand. If it helps, please adopt it. Thank you!