как найти радиус вписанной окружности (формула)

Магазин должен заказать поставщикам столько же килограммов сахара , сколько и муки. Сахар расфасован в 50-килограммовые мешки, а мука - в 60-киллограммовые. По сколько килограммов сахара и муки может заказать магазин, если в хранилище помещается не более 22 мешков?

Помогите пожалуйста решить тест по английскому! Очень вас прошу!!! :)

c) If I could drive we-----------------to take the car.
1)would be able 2)will be able 3) shall be able

5. Выбери нужное 

a) The lorries .... in Japan last year.
1) were made 2) will be made
3) have been made 4) are made

b) We knew that the boys ......with us.
1) was angry 2) have been angry
3) were angry 4) will be angry

6. Укажите правильный вариант 
1) I wonder……
a)where he is. b) where is he .
2) Mike asks me …….
a) is he right. b) if he is right.
3) I doubt……..
a) if she will call Nick. b) will she call Nick.
7. Подбери правильный предлог 
1) I couldn’t listen ------the radio.
a)at b) to c) on
2) I am proud--------- my elder brother.
a) on b) from c)of d) at
3) She objects …… our criticism.
a) at b) for c) from d) to
4) She looks ……..her little brother like a mother.
a) after b) for c) through

8. Выбери нужное 
a) Ellen... a hard life before she got married.
1) had 2) has had
3) had had 4) will have

b)You.... to read the book again.
1) can 2) must
3) will have 4) was able

c) Dust slowly covered .......
1) something 2) everything
3) anything 4) nothing

9. Выбери нужное 
a) «Whose picture is it?» -« It’s .......»
1) him 2) mine
3) her 4) your

b) That’s good news, .... ?
1) isn’t it 2) aren’t they
3) is it 4) are they

c) We all ....him good luck when he was leaving.
1) told 2) wished
3) said 4) gave??? 

Заранее вас благодарю!

Представители каких народов в начале XVI века были подданными московского великого князя?