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Ask me a math problem!
Salt water concentration is the mass of salt divided by the mass of salt water.

The quality of salt has not changed, so it is x% a.

The quality of brine used to be a gram, but now it is added with b gram, so it is a+b gram.

As for the latter multiplied by 10, I guess you are wrong, and it should be multiplied by 100%.

Hope to help the landlord!