I was very nervous before a new year. Beside with me was my family and friends. We decorated the house and it requires a lot of time and effort. After a new year we're went to the cinema and the system have special equipment. and during the holidays there was a case. Today is arrived my love band and I went to the concert. We heard a recording behind the scenes. It was fun. After this we went to the home. And sinoptic predicted very warm weather. We went to the street and I made a desire from Santa. Verity and health. It was a cool winter holidays.
60-100%
x-7% x=(60*7)/100=4.2г- столько нужно добавить поваренной соли, чтобы получить семи процентный раствор