percentages

Huỳnh Anh Phương

18/06/2018 at 03:30

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Look at the summary, make the problem, then answer the solution. Express your answer by the common percentages.

percentages

Nguyễn Mạnh Hùng 18/06/2018 at 08:00

Problem: A and B have 88 marbles, B has 23 marbles. How many marbles does A have?

Solution: A has the number of marbles is: 88 - 23 = 65 ( marbles)

Answer: 65 marbles

Huỳnh Anh Phương

12/06/2018 at 12:31

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Anna has 708 strawberries. She uses 12 strawberries to make cake, 20 strawberries to make juice. What percent Anna have left?

double counting percentages

Nguyễn Mạnh Hùng 14/06/2018 at 02:10

After using strawberries to make cake and make juice, Anna's strawberries left is:

708-12-20=676(strawberries)

Anna is only has:

676:708$\approx0,95=95\%$
Huỳnh Anh Phương selected this answer.

huynh anh phuong

23/05/2018 at 10:19

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The school has 900 students. 25% of them are weak students. How many students are good students?

percentages

Huy Toàn 8A (TL) 25/05/2018 at 02:05

C1 : Lê Quốc Trần Anh and Đào Trọng Luân

C2:

There are : 100% - 25% = 75% (students) are good students

There are all good students : 900 . 75% = 675 (students) are good students
Lê Quốc Trần Anh Coodinator 23/05/2018 at 11:06

There are: $900.25\%=225\left(students\right)$are weak students

So there are: $900-225=675\left(students\right)$ are good students
Nguyễn Thành Long 26/05/2018 at 08:46

There are 100% - 25% = 75% are good students

So there are 900.75%=675 ( students ) are good students

Nguyễn Phương Linh

23/04/2017 at 15:44

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Class 5A is going to grow 180 trees. Now they have grown 45% number of trees. How many trees are class 5A have to grow more?

percentages

Lê Mạnh Tiến Đạt 23/04/2017 at 21:14

The number of 5A field was developed are:

180 : 100 x 45% = 81 ( trees )

Number of 5A plants to be planted is :

180 - 81 = 99 ( trees )

Đ/S: 99 trees

Wish you good study
congtung123 24/04/2017 at 17:52

eighty-one trees
Anh Lê Vương Kim 23/04/2017 at 17:21

eighty-one trees

Vũ Hà Vy Anh

11/04/2017 at 18:03

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mix 25 tons of iron ore containing 72% iron with 25 tons of iron containing 60% irons .How many percent of iron ore does that mixture of iron ore contain?

percentages

Phan Thanh Tinh Coodinator 16/04/2017 at 06:03

First 25 tons of iron ore contain :

25 : 100 x 72 = 18 (tons of iron)

Second 25 tons of iron ore contain :

25 : 100 x 60 = 15 (tons of iron)

The mixture of iron ore weighs :

25 + 25 = 50 (tons)

The mixture of iron ore contains :

18 + 15 = 33 (tons of iron)

The percentage of iron to the mixture is :

33 : 50 = 66 : 100 = 66%

The percentage of iron ore to the mixture is :

100% - 66% = 34%
Vũ Hà Vy Anh selected this answer.
FA KAKALOTS 03/02/2018 at 12:38

First 25 tons of iron ore contain :

25 : 100 x 72 = 18 (tons of iron)

Second 25 tons of iron ore contain :

25 : 100 x 60 = 15 (tons of iron)

The mixture of iron ore weighs :

25 + 25 = 50 (tons)

The mixture of iron ore contains :

18 + 15 = 33 (tons of iron)

The percentage of iron to the mixture is :

33 : 50 = 66 : 100 = 66%

The percentage of iron ore to the mixture is :

100% - 66% = 34%

Min Hoang moderators

16/03/2017 at 14:02

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Linda received 100 dollars in cash for mowing lawns. She did the following with the 100 dollars:

- Put 30% of the $100 into a bank account.

- Spent $\dfrac{1}{5}$ of the 100 dollars.

- Kept the rest of the 100 dollars in cash.

How much of the 100 dollars did Linda keep as cash?

Fraction percentages

¤« 08/04/2018 at 15:10

Change: 30%=310

Linda kept: 1−(15+310)=12

of the 100 dollars as cash.
Nguyên Hạo 16/03/2017 at 14:57

Change: $30\%=\dfrac{3}{10}$

Linda kept: $1-\left(\dfrac{1}{5}+\dfrac{3}{10}\right)=\dfrac{1}{2}$ of the 100 dollars as cash.
In the name of love 16/03/2017 at 21:06

have : 30%=$\dfrac{3}{10}$

Linda kept : 1-(1/5+3/10)=1/2

Answer : Linda kept 1/2 of the 100 dollars as cash

percentages

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