Имеется 200 г раствора с массовой долей соли 10%. Определите массовую долю соли в растворе, который образуется при добавлении к исходному

I found one suspicios person in the Airport. He wore clean black coat,jeans and boots. He held a big strange bag in his arms,I think, this bag was made for medicine. I saw a big red plus on it.
I thought alot,but then I decided to speak to him-I bored waiting. I knew so much more about him. He is a doctor,and he is going to fly to USA and get a good job. He is British,but he doesn't like this country because of weather. So he wanted to fly to sunny New-York and become a famous surgery(хирург).