percentages

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Huỳnh Anh Phương
18/06/2018 at 03:30
Votes Answers Follow

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

88 marbles 23 marbles ?%

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    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 

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    lê đức anh 10/01/2020 at 13:22

    Vấn đề:Một cái hộp có 88 viên bi,trong đó số viên bi đen là 23.Tính tỉ số phần trăm số bi còn lại so với số bi trong hộp.

    Giải:

      số bi còn lại là

           88-23=65 viên

      tỉ số phần trăm giữa số bi còn lại và số bi trong hộp là

             65:88x100=73,86%

                        đ/s:73,86%


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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?
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    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.
  • ...
    lê đức anh 10/01/2020 at 13:24

    95% nha


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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?
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    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

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    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

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    lê đức anh 10/01/2020 at 13:24

    675

    hk tốt


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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?
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    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 ok

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    congtung123 24/04/2017 at 17:52

    eighty-one trees

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    Anh Lê Vương Kim 23/04/2017 at 17:21

    eighty-one trees


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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?
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    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%

  • ...
    lê đức anh 10/01/2020 at 13:25

    34%'

    ok 


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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?
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    ¤« 08/04/2018 at 15:10

    Change: 30%=310

    Linda kept: 1−(15+310)=12

     of the 100 dollars as cash.

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    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.

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    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