400 + 20 = 420 г масса раствора
W=(масса вещва/масса раствора)*100%(смотря в чем тебе надо!!Если в процента то ответ как у меня, а если вроде в долях то не умножай на 100%)
w=20/420*100
w=примерно 4,8%
<span>1. I had a talk in class.
2. We had a nice holiday.
3. Let's go for a ride.
4. I need a rest.
</span>
1 She has made several mistakes.
2 Could you make a phone call at 7?
3 I'm busy. I have to do my homework.
4 I don't like to make beds but I have to do it every morning.
5 On Fridays she does the washing up.
6 Nice to meet you. Would you make a cup of coffee, please.
7 He is working that's why he is making a terrible noise.
8 If I have free time i like doing shopping with my Mum.
9 My granny is doing the ironing right now.
10 I'll try to do it. I'll do my best.
1 He asked if you would train local people.
2 This doctor will treat his patients well
3 There is some medical equipment there, isn't there?
4 If you improve conditions i'll sign the document
5 That feels useful, doesn't it?
6 Health care is the main issue in developing states.
7 She has her own family and a rather good career.
8 What is the secret of his business success?
9 He will retire at 65.
10 This plant continues to grow any time you water it.
11 Look at him! He is a good example of a person who has a normal personal life.
12 To start a business you need money it's the cornerstone.
13 They put huge amounts of money into that sphere so it's flourishing.
14 Health is above wealth.
15 After watching the show I have mixed feelings
<span>3. Эстебан Кортезар - молодой человек, чья любовь к моде началась еще когда он был ребенком и жил в Колумбии. Он начал придумывать одежду в возрасте 10 лет. Он разрезал старую одежду и обратно сшивал кусочки. Сегодня Эстебан - глава растущей модной империи. Недавно он ездил на неделю моды в Нью Йорк, где представлял свою последнюю коллекцию. Эстебан нацелен на успех и, кажется, он идет в верном направлении!</span>
He is doing his homework right now. (utv)
He isn't doing his homework right now. (otric)
Is he doing his homework right now? (vopr)