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Hint: Supppose that Darwin bought x eraser boxes, then he bought \(\frac{4}{5}x\) pencil boxs. (\(x\in N,x>0\)

Because Darwin spent 240 dollars so we have equation:

\(4x+\left(4+6\right).\frac{4}{5}x=240\)

\(\Rightarrow12x=240\Rightarrow x=20\)

So Darwin bought 20 eraser boxes and 16 pencil boxes.

Have a good time :))

 I don't no

Một hộp tẩy giá 4 USD. Một hộp bút chì có giá 6 đô la hơn. Darwin đã chi 240 đô la trên một số hộp tẩy và bút chì. Tỷ lệ số lượng các hộp bút chì để số lượng các hộp tẩy là 4: 5. ông đã mua bao nhiêu hộp bút chì?

Các chi phí trong tám thìa là 4 đô la . làm 6 thìa chi phí bao nhiêu?

Các chi phí trong tám thìa là 4 đô la . làm 6 thìa chi phí bao nhiêu?

6 spoons is 12 dollars

Nếu viết chỉ bằng if thì chỉ có 1 cách thôi nha

1/We dont have a lot of money, so we dont buy a lot of new books

=> If we had a lot of money, we would buy a lot of new books

2/I cannot take a photo of us because I can't find my camera.

=> If I found my camera, I could take a photo of us

3/Ilose the key, so I cannot get into the house.

=> If I didn't lose the key, I could get into the house

4/I am not free today, so we can't go to the beach.

=> If I were free today, we could go to the beach

5/ She doesn't know the answers, so she cant tell you.

=> If she knew the answers, she could tell you

1.How many meals do you eat every day?

2.We haven’t got much bread. Can you buy some?

3.There wasn't much food at the party, so I'm still hungry!

4.You eat too many sweets. They’re bad for your teeth.

5.Do you eat much fruit?

6.How much rice do you want? A lot or just a little?

7.You didn't cook many peas. Are you sure there are enough for all of us?

8.I don’t want too much spaghetti. I’m not really hungry.

9.There's too much butter on that toast! It's not healthy.

10.I don’t eat many eggs. I don’t really like them.

1.The robbers escaped without being caught with got a thousand dollars

2.My father bought of a new car last week

Chào em, em tham khảo nhé!

1. The robbers escaped with a thousand dollars without being caught.  GOT

=>The robbers got away with a thousand dollars.

2. My father is going to buy a new car next week.  OF

=> My father has an intention of buying a new car next week.

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IX. Complete the second sentence so that it has the similar meaning to the first one.

1. How much does it cost you to buy that souvenir in dollars?

How many……dollars does that souvenir cost…………………………………………………………………………

2. When did you have it?

How long…………have you had it……………………………………………………………………

3. These Dong Ho paintings are more expensive than those modern paintings.

Those modern paintings are not …as expensive as these Dong Ho paintings………………………………….

4. Jane didn’t go fishing yesterday because it rained heavily.

Because of……………the heavy rain, Jane didn't go fishing………………………………………………………………

5. This is the first time I have seen him.

I have never ……seen him before…………………………………………………………….

X. Complete each of the following sentences with the words or phrases given.

1. Volunteers/wash/dirty clothes/classify/before/give/the poor.

Volunteers wash the dirty clothes and classify them before giving them to the poor

2. your children/go/camp/every summer holiday? 

 Do your children go camping every summer holiday?

3. my cousin/give/me/book/gift/next birthday.

My cousin will give me a book as a gift on my next birthday

4. I/enjoy/play/sports/because/it/good/health. 

I enjoy playing sports because it is good for my health

5. he/find/mountain climbing/dangerous/so/he/not take/it. 

He finds moutain climbing dangerous so he does not take it

IX. Complete the second sentence so that it has the similar meaning to the first one. 1. How much does it cost you to buy that souvenir in dollars?

How many dollars does it cost you to buy that souvenir?

2. When did you have it?

How long have you had it?

3. These Dong Ho paintings are more expensive than those modern paintings.

->Those modern paintings are not as expensive as These Dong Ho paintings

4. Jane didn’t go fishing yesterday because it rained heavily.

Because of the heavy rain, Jane didn’t go fishing yesterday 

5. This is the first time I have seen him.

I have never seen him before

X. Complete each of the following sentences with the words or phrases given. 1. Volunteers/wash/dirty clothes/classify/before/give/the poor.

-> Volunteers wash dirty clothes classify before giving the poor

2. your children/go/camp/every summer holiday? 

-> Do your children go camping every summer holiday?

3. my cousin/give/me/book/gift/next birthday.

-> My cousin will give me a book as a gift on my next birthday

4. I/enjoy/play/sports/because/it/good/health.

-> I enjoys playing sports because it is good for my health

5. he/find/mountain climbing/dangerous/so/he/not take/it. 

-> He found mountain climbing dangerous so he didn't take it.

1. How many languages will be spoken in 2100?

2. Roger wants to buy a book, so he has just gone to the town.

3. The new models are not only economic but also attactive.

4. We couldn't sleep last night because of the noise next door.

1/ We are very happy to have a friend ……with..…………you.

2/ The children are very excited ………..about……..their next summer holiday.

3/ You can buy many things ………on..……………sale at the fair.

4/ My sister is known ……as……….... the most beautiful girl in her class.

5/ There was a meeting ………between…..…..the students and the teachers.

6/ Children  usually get bored ……with…..……reading long books.

7/ The Mona Lisa is a painting ……of…..……Leonardo de Vinci.

8/ Chocolate is made ……of…………milk, cocoa and favoring.

9/ Tam had high marks…in……..…exams…after………working very hard…..…at…school.

10/ We are interested …in………….joining sports very much.