А)во сколько раз четыре двадцать пятых от 75 меньше,чем девять семнадцатых от 68

Чем можно объяснить медленный рост населения Европы в 16-18 веках ?

40 мальчиков и 28 девочек встали в круг.Ровно у 18 мальчиков соседка справа девочка .у скольки мальчиков соседка слева девочка?

Fill in the gaps with the correct passive tense of the verbs in brackets.(те слова которые в скобках,поставить в правильном ...первое пример )

1. A: These flowers are great.
    B: They ...were sent... (send) to me yesterday by one of my fans.
2. A: Have you ever appeared on TV?
    B: Actually. I ......................... (recently/ask) to take part in a show.
3. A: When will I have my car?
    B: It    ............................... (deliver) to your house the day after tomorrow.
4. A: So. when did they tell you about the robbery?
    B: I ............................ (inform) by the police as soon as they found out.
5. A: Why can't we go over the bridge?
    B: Because it ............................. (repair) at the moment.
6. A: I'm tired.
    B: So am I. But these reports must ............................ (type) before we leave.
7. A: Who looks after your baby when you're at work?
    B: Well, he ......................... (look after) by my mother.
8. A: Those pictures are beautiful.
    B: They .......................... (paint) by my father while he was on holiday last summer.
9. A: Who does the washing-up in your house?
    B: The dishes ..............................(wash) by my brother and then they .................... (dry) by my sister.
10. A: Why can't I use your car?