Just a few years ago, this place was called Dumptown. The people living here didn't think much about where waste went when they threw it out. Things that could be reused or recycled were thrown in the trash, because nobody believed recycling made a difference. And, eventually, that became a very big problem.The garbage heap grew and began to smell. Sometimes it caught fire, and making it hard for everyone to breathe. Dumptowners knew they had to fix it.They learned to reduce the amount of waste they threw away. For example, they learned to reuse things like washing out empty jars instead of throwing them away. And, they learned to recycle. They set up bins around town to collect glass, paper, and other things, then made into new products.

1. The people living in Dumptown_______.

a. didn't think much about where the waste went

b. threw things that could be reused or recycled into the trash

c. didn't believe that recycling could make a difference

d. all are correct

2. Which of the following could replace the word 'trash' in line 3?

a. garbage b. rubbish c. compost d. a & b

3. What does the word 'them' in the line 8 refer to?

a.empty jars b. the garbage heap c. the trash d. Dumptowners

4. What were the Dumptown's problems?

The people living here didn't think much about where waste went when they threw it out. Things that could be reused or recycled were thrown in the trash, because nobody believed recycling made a difference. And, eventually, that became a very big problem.The garbage heap grew and began to smell. Sometimes it caught fire, and making it hard for everyone to breathe.

5. Did they learn to reuse empty jars instead of throwing them away?

Yes, they did.

6. What did they do to solve their problems?

They learned to reduce the amount of waste they threw away. For example, they learned to reuse things like washing out empty jars instead of throwing them away. And, they learned to recycle. They set up bins around town to collect glass, paper, and other things, then made into new products.

36 chai đựng xăng chứa là :

0,75 x 36 = 27 ( l )

36 vỏ chai đựng xăng nặng là :

36 x 0,25 = 9 ( kg )

800 g = 0,8 kg 

36 chai đựng đầy xăng nặng là :

( 27 x 0,8 ) + 9 = 30,6 ( kg )

Đáp số : 30,6 kg

mk nhanh nhất mà làm ngơ à 

số liền sau : tăng thêm 1 đơn vị

Vậy số liền sau của 3.a - 1 là:

3.a - 1 + 1 = 3.a

đáp số : 3.a

nếu giảm chiều dài đi 2 dm thì chiều dài còn lại là

6,75-2=4,75(dm)

ta có : diện tích ban đầu: 6,75xb

          diện tích lúc sau: 4,75xb

            hiệu giữa 2 tích : 6,9dm²

suy ra 6,9 dm²= 2xb

vậy chiều rộng của mảnh đất là

6,9:2=3,45 dm

diện tích của mảnh bìa ban đầu là

3,45x6,75=23,2875dm² hay 2328,75 m²

đáp số: 2328,75 m²

   suy ra 

số liền sau : tăng thêm 1 đơn vị

Vậy số liền sau của 3.a - 1 là:

3.a - 1 + 1 = 3.a

đáp số : 3.a

số liền sau : tăng thêm 1 đơn vị

Vậy số liền sau của 3.a - 1 là:

3.a - 1 + 1 = 3.a

đáp số : 3.a

Kb vs mình đii

Số học sinh nữ là :

           35 : [ 3+2] *3 = 21 bạn

                                 Đ/S 21 bạn nữ

Vận tốc của thuyền khi xuôi dòng là:
7,2 + 1,6 = 8,8 (km/giờ)

Vậy nếu thuyền xuôi dòng thì trong 3,5 giờ sẽ đi được:

8,8 x 3,5 = 30,8 (km)

Vận tốc của thuyền khi ngược dòng là;

7,2 - 1,6 = 5,6 (km/giờ)

Khi ngược dòng, thuyền đi 30,8km trong:

30,8 : 5,6 = 5,5 (giờ)

Đáp số: a) 30,8km

            b) 5,5 giờ