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Như Nguyễn Thị Quỳnh

22/05/2017 at 10:37
Answers
8
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The average height of 2 boys is 131.6cm. The average height of 4 girls is 128.3cm. What is the average height of all children?

Help me! khocroi




    List of answers
  • ...
    Trần Nhật Quỳnh 22/05/2017 at 10:39

    Total height of 2 boys are: 131.6 x 2 = 263.2(cm)
    Total height of 4 girls are: 128.3 x 4 = 513.2(cm)
    Total height of all children are: 263.2 + 513.2 = 776.4(cm)
    The average height of all children are: 776.4 : 6 = 129.4(cm)

                                                                           Answer: 129.4cm

    leuleu

    Như Nguyễn Thị Quỳnh selected this answer.
  • ...
    →இے๖ۣۜBoy™†hïếuGîa 02/06/2017 at 10:10

    Total height of 2 boys are: 131.6 x 2 = 263.2(cm)
    Total height of 4 girls are: 128.3 x 4 = 513.2(cm)
    Total height of all children are: 263.2 + 513.2 = 776.4(cm)
    The average height of all children are: 776.4 : 6 = 129.4(cm)

                                                                           Answer: 129.4cm

  • ...
    Lê Mạnh Tiến Đạt 31/05/2017 at 17:03

    Total height of 2 boys are: 131.6 x 2 = 263.2(cm)
    Total height of 4 girls are: 128.3 x 4 = 513.2(cm)
    Total height of all children are: 263.2 + 513.2 = 776.4(cm)
    The average height of all children are: 776.4 : 6 = 129.4(cm)

                                                                           Answer: 129.4cm

  • ...
    Băng Tâm 28/05/2017 at 18:12

    The total height of 2 boys: \(131.6\cdot2=263.2\left(cm\right)\)

    The total height of 4 girls: \(128.3\cdot4=513.2\left(cm\right)\)

    The total height of all children: \(263.2+513.2=776.4\left(cm\right)\)

    All children: \(2+4=6\left(children\right)\)

    The average height of all children: \(\dfrac{776.4}{6}=129.4\left(cm\right)\)

  • ...
    Lê Mạnh Tiến Đạt 31/05/2017 at 17:03

    Total height of 2 boys are: 131.6 x 2 = 263.2(cm)
    Total height of 4 girls are: 128.3 x 4 = 513.2(cm)
    Total height of all children are: 263.2 + 513.2 = 776.4(cm)
    The average height of all children are: 776.4 : 6 = 129.4(cm)

                                                                           Answer: 129.4cm

  • ...
    Lương Trí Dũng 22/05/2017 at 16:02

    Total height of 2 boys are: 131.6 x 2 =

    263.2(cm)
    Total height of 4 girls are: 128.3 x 4 =

    513.2(cm)
    Total height of all children are:

    263.2 + 513.2 = 776.4(cm)
    The average height of all children are:

    776.4 : 6 = 129.4(cm)

                              Answer: 129.4cm

    yes 100%

  • ...
    Nguyễn Thị Thu Thủy 22/05/2017 at 15:39

    Total height of 2 boys are:

                    131.6 x 2 = 263.2(cm)
    Total height of 4 girls are:

                          128.3 x 4 = 513.2(cm)
    Total height of all children are:  

                    263.2 + 513.2 = 776.4(cm)
    The average height of all children are:

                   776.4 : 6 = 129.4(cm)

  • ...
    Thái Văn Thắng 22/05/2017 at 15:00

    hehe Trần Nhật Quỳnh đúng rồi


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