5 con kangaroo gồm hai con nhẹ nhất và ba con nặng nhất chiếm 25% + 60% = 85%. Vậy còn lại 15%.

15% này tương ứng với 1 con kenguru, vì nếu có 2 con trở lên, 1 trong hai con đó sẽ có cân nặng không quá 7,5% tổng cân nặng của các con, điều này mâu thuẫn với thông tin là 2 con kangaroo nhẹ nhất cân nặng bằng 25% cân nặng của cả nhóm.

Vậy nhóm kangaroo có 6 con (gồm 2 con nhẹ nhất, 1 con 15% ở giữa và 3 con nặng nhất).

sai het rui

Correct verbs in the brackets:

1.She is very interested in (read) .............. books.

mik nha

đổi 3dm2cm=32cm

cạnh của hình vuông là

32:4:8(cm)

diện tích hình vuông đó là

8x8=64(cm)

đ/s:64cm

tích cho tớ đi tớ làm trước đó

1+5=6 nhe

Correct verbs in the brackets:

1.Jane is twenty years old.She (live) .............. with her family in an apartmen in Lon Don in her family.There (be) .............. four people in her family.Her parents (work) ............. in a hospital.Her brother is a student at university. Jane (work) ............ as a travel writer for a magazine.She (go) ........... abroad five or six times a year.Now she (travel) .......... in South America.She (not speak) ................ Spanish very well but she (study) .............. at the moment because she (need) ............ to talk to local people and planes.

2.It (be) ....... ten o'clock.We (learn) ............. our lesson.

3.When your children (be) ........?-They're upstair.They (play) .............. video games.

4.Children (ask) ........... a lot of question.

5.Nam and Ha (make) ............. a cup of tea.

6.The sun (shine) .............. beatiful today.

7.They ought to (study) ............. harder.

8.They (use to) ................ live in Ha Noi.

9.He sent a telegram for his mother (learn) ................ good news.

10.George is intersted in (take) .............. an art class.

11.It often (take) .......... me twenty minutes to go to school.How long it (take) ............ you,Linh?

12.My sister (go) ........ to the Youth club every weekend.She enjoys (play) .............

13.I'd like (drink) ............ some orange juice.

14.Would you like (come) ................ to my house for lunch?

1.Use the correct tense of these verds in each sentence:

1.My friend (have) ............. a small rice paddy and he (produce) .............. some rice there.

2.His chickens (not produce) ................... many eggs.

3.Why (the world/need) ....................... more land and food?

4.Mr Dan (not raise) ............. cows on his farm.He (raise) ................. buffalo.

5.What ............. she (like/do) ............... in her spare time?

6.He (need) .............. (study) .................. harder if he (want) ................. to pass the exam.

7.Their house is small.They'd like (buy) ................. a bigger house.

2.Put the question for the underlined words:

1.Thu has lunch at 11:30 a.m every day.

Use the corect tense of these verds in each sentence:

1.Mr Brown (teach) ............ us English.

2.What (your parents/do) .............. in their free time?

3.They (speak) ............... English fluently someday.

4.Where (be) .............. Mom?-She (cook) ............... in the kitchen.

5.Would you like (come) ................ to my house for dinner?

6.I'd like (drink) .............. a cup of coffe.

7.The children (like/eat) ................. candy every much.

8.She (like/listen) .............. to music in her free time.

9.What ............... you (like/do) ............... on Sundays?

10.The weather (not be) ................ warm today.

11................. your uncle (plant) .............. many flowers in the garden?

12.What ................ your father often (do) ............... in the evening?

13.Lan and Phuong (be) .............. in the kitchen.They (cook) .............. dinner.

14.Look ! The plane (fly) .............. towards the airport.It (land) ..................

15.My brother and I (visit) ............. our grandmother on the weekend.

16.Where (be) ......... you,Nam?-I'm here . I (read) ............. in my room.

17.(You/play) ............... soccer in the year next Sunday?

18.What (there/be/drink) ................. for dinner?

19.We (be) ........... tired and we'd like (sit) ................ down.

20.What (your sister/want) ................... ?-She (want) .............. a cold drink.

Exercise 1: Use the correct tense of these verds in each sentence:

1.My friend (enjoy) ..................... hamburgers every much.

2.We always (do) ........... English exercises carefully.

3.The sun (rise) ................ in the east.

4.My sister (need) .................. some money for books.

5.It (rain) ................. very much in the United States.

6.Thu (not have) ............. any apples. She (have) ..................... some oranges.

7.This book (belong) ............ to me.