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MA
Mischievous Angel
25 tháng 4 2016

A box of erasers cost 4 dollars. A box of pencils cost 6 dollars more. Darwin spent 240 dollars on some boxes of erasers and pencils. The ratio of the number of pencil boxes to the number of eraser boxes was 4:5. How many boxes of pencils did he buy?
#Toán lớp 8
5
CH
Cô Hoàng Huyền
Admin VIP
26 tháng 4 2016

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 :))

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TD
Tứ Diệp Thảo_TFBoys
25 tháng 4 2016

 I don't no

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LQ
Lưu Quốc Việt
1 tháng 1 2020

A certain number of fifty-cent coins is to from an equilateral triangle. The same number of fifty-cent coins can also be used to from a square. The number of fiftty-cent coins on each side of the square is 6 fewer than the number of fifty-cent coins on each side of the equilateral traingle. How many fifty-cent coins are there altogether?
#Toán lớp 8
0
AA
Ai Ai
23 tháng 7 2020

There're four black box and each box has the same number of marbles. Only one of the following statements is correct about the number of marbles in it.

- Five or Six

- Seven or Eight

- Six or Seven

- Seven or Five

How many marbles are there in each box?
#Toán lớp 8
3
MN
Minh Nguyệt
23 tháng 7 2020

À là 8 đó bạn, mk bị lag tí......

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MN
Minh Nguyệt
23 tháng 7 2020

à nhầm có 2 nha

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NH
Nguyễn Hồng Mến
6 tháng 4 2015
1,A circular cynlinder with a volume 81 pi.if the perimeter of the base is 6 pi,the height is ?2,The total surface area of 2 indentical blocks which together with the volume is 1,458 units is ?3,If one side of 6-inch ruler will be marked in inches,how many points will be in the edge including 0 and 6 inch mark?4,Two sides of the O and P pointer that started from a vertical position as shown.Pointer O turns back the clock with a speed of 5 degrees per second and pointer P rotate clockwise at9...
Đọc tiếp

1,A circular cynlinder with a volume 81 pi.if the perimeter of the base is 6 pi,the height is ?

2,The total surface area of 2 indentical blocks which together with the volume is 1,458 units is ?

3,If one side of 6-inch ruler will be marked in inches,how many points will be in the edge including 0 and 6 inch mark?

4,Two sides of the O and P pointer that started from a vertical position as shown.Pointer O turns back the clock with a speed of 5 degrees per second and pointer P rotate clockwise at9 degrees per second.How many complete revolutions will be made when completing 335 P O complete revolution?

5,In a certain game of 50 questions,the final score calculated by subtracting tiwce the number of wrong answer from the total number of correct answers.if a player has tried all questions and get a final score of 35 ,the number of wrong answers,he has to be ...
#Toán lớp 8
0
LT
Lê Thu Trang
10 tháng 6 2018

The average of three numbers is 42. All three are whole positive number and are different from each other. 
If the least number is 20, what could be the greatest possible number of the remaining two numbers? 
#Toán lớp 8
2
HT
Hoàng Trúc Nhi
10 tháng 6 2018

thích ra vẻ bằng cách viết tiếng anh à

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TQ
trần quang minh
21 tháng 12 2019

Đề của toán tiếng anh mà

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NV
Nguyễn Võ Văn Hùng
12 tháng 2 2017

The average of three numbers is 42. All three are whole positive number and are different from each other.
If the least number is 20, what could be the greatest possible number of the remaining two numbers?
Answer: ......

#Toán lớp 8
2
NQ
Nguyễn Quang Định
12 tháng 2 2017

106 mình nghĩ là vậy

(a+b+c):3=42=>a+b+c=126

Cho a< nhất, a=20 ( đề cho) => b+c=126-20=106

Vậy số lớn nhất có thể là 106

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MT
Minh Trúc
12 tháng 2 2017

Gọi 3 số là a,b,c:
(a+b+c)/3=42
đặt a là số bé nhất =>a=20(gỉa thiết)
a+b+c=42.3=126,mà a=20
=>b+c=126-20=106
Vậy tổng 2 số nguyên dương còn lại là 106

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F
fffffffffffffffff
17 tháng 12 2021
In a park in a small town in central England, John Pickering cuts the grass and waters the flowers. But all last week he was in Tokyo and millions of Japanese people watched the thirty-five-year-old gardener on television because John is the number one singer in Japan at the moment. John visited Japan a few months ago to sing in dance clubs in Osaka and Nagoya. A discjockey heard his songs and played them on his radio show. Hundreds of young people phoned the radio and asked the discjockey to...
Đọc tiếp

In a park in a small town in central England, John Pickering cuts the grass and waters the flowers. But all last week he was in Tokyo and millions of Japanese people watched the thirty-five-year-old gardener on television because John is the number one singer in Japan at the moment. John visited Japan a few months ago to sing in dance clubs in Osaka and Nagoya. A discjockey heard his songs and played them on his radio show. Hundreds of young people phoned the radio and asked the discjockey to play the songs once more.
            John, who uses the name Jon Otis when he sings in Japan, is not going to stop working in the park in England. He does not know yet how much he will earn from his music. T must keep my job in the park,’ he says. T still have to pay my bills!’ The other gardeners do not know that he is famous in Japan. They’ve never even heard him sing.
            John’s wife, Denise, a hospital worker, says, ‘This will not change the way we live. I only know John Pickering, not Jon Otis!’

20.John Pickering usually works in England
A Right B Wrong C Doesn’t say
21 A few days ago, John was on television in Japan.
A Right B Wrong C Doesn’t say
22 John’s first show in Japan was on the radio.
A Right B Wrong C Doesn't say
23 John hopes to become famous in England one day.
A Right B Wrong C Doesn’t say
24 John Pickering and Jon Otis are the same person.
A Right B Wrong C Doesn't say
25 John will still work in the park because he needs the money.
A Right B Wrong C Doesn’t say
26 John’s colleagues think his songs are very good.
A Right B Wrong C Doesn't say
27 John’s wife would like him to stop singing.
A Right B Wrong C Doesn’t say 
#Toán lớp 8
0
NH
Ngô Hồng Thuận
5 tháng 4 2016

Toán tiếng Anh: The average of three numbers is 42. All three are whole positive number and are different from each other.

If the least number is 20, what could be the greatest possible number of the remaining two numbers?

Answer: {}.
#Toán lớp 8
1
AI
alpha ikaros
5 tháng 4 2016

nhấn " google dịch " mọi chuyện xong hết
 

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NH
nguyễn hữu kiên
10 tháng 1 2020

we have 1234 is a four-digit number that the product of it is 24.how many 4-digit number that the product of it is 24?
#Toán lớp 8
1
TA
Thiên Ân
10 tháng 1 2020

google dịch rồi tự làm đi

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Tất cả Toán Vật lý Hóa học Sinh học Ngữ văn Tiếng anh Lịch sử Địa lý Tin học Công nghệ Giáo dục công dân Âm nhạc Mỹ thuật Tiếng anh thí điểm Lịch sử và Địa lý Thể dục Khoa học Tự nhiên và xã hội Đạo đức Thủ công Quốc phòng an ninh Tiếng việt Khoa học tự nhiên
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