Có tổng số kg gạo là:

\(300 \times 60 = 18000 (kg)\)

Sau một ngày cửa hàng đó bán hết số gạo là: 

\(18000 \times \dfrac{1}{9}=2000(kg) \)

Của hàng đó còn lại số kg gạo là: 

\(18000- 2000=16000(kg)\)

Đổi 16000 kg = 160 tạ

Đáp số: 160 tạ

Nếu phơi 420 kg cà phê tươi thì thu hoạch được số kg cà phê khô là: 

\(420 : 20 \times 5 = 105(kg)\)

Đáp số: 105 kg

1 took

2 has not missed

3 cried

4 has seen

5 scored

6 went

VI

1 has taken 

2 was

3 began

4 has always existed

5 has always been

6 gave

7 has appeared

8 appeared

9 has become

10 has never had

VII

1 grown up

2 has lived

3 became

4 made

5 posted

6 have watched

7 has already had

8 hasn't been

13 had - would go

14 had known - would have come

15 will we do

16 would write

17 were - would know

18 eat - will get

19 comes - will lose

20 will let - find

21 lived

22 arrived

23 will phone

24 would give

25 would be

26 will go

27 will have

28 will feel - stop

29 were - would help

30 will understand - speal

31 had listened - would have performed

32 comes - will have

33 had afforded - would have been

34 have

35 would go

36 weren't - would show

37 will be - use

38 had - would make

39 doesn't like

40 will be - hears

41 will have

42 like - will get

43 were - would play

44 stopped - would be

45 were - would live

Ex8

1 If he didn't have to study for his exam, he could go out

2 If she weren't lazy, she could pass the exam

3 If he pay me tonight, I will have enough money to buy a car

4 If he didn't smoke too much, he could get rid of his cough

5 If she weren't shy, she  would enjoy the party