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Math problem: For a cup of salt water, the ratio of salt to salt water is 1: 5. After adding16g of salt, the ratio of salt to salt water is 1: 4. How many kilograms of salt water are there?
The water quality is constant.

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.

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