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    At a school
    number of boys:number of girls =11:9
    there are 124 more boys than girls
    work out the total number of students at the school
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    (Original post by lolu123)
    At a school
    number of boys:number of girls =11:9
    there are 124 boys then girls
    work out the total number of students
    u sure this isn't uni level maths - too difficult
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    its on mathswatch
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    Whate grade
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    what*
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    (Original post by lolu123)
    At a school
    number of boys:number of girls =11:9
    there are 124 boys then girls
    work out the total number of students
    Please read through this question and check you've typed it correctly.
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    (Original post by Notnek)
    Please read through this question and check you've typed it correctly.
    i meant to stay number of students at the school
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    (Original post by lolu123)
    At a school
    number of boys:number of girls =11:9
    there are 124 boys then girls
    work out the total number of students
    I am not from UK but this is really basic, don't you learn the rule of three ( not sure if this is the proper translation ) ?
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    (Original post by lolu123)
    i meant to stay number of students at the school
    there are 124 boys then girls

    This doesn't make sense. Please edit your post to correct it.
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    (Original post by Notnek)
    there are 124 boys then girls

    This doesn't make sense. Please edit your post to correct it.
    i have now
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    (Original post by AndreiMiron)
    I am not from UK but this is really basic, don't you learn the rule of three ( not sure if this is the proper translation ) ?
    work it out then
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    (Original post by lolu123)
    work it out then
    ok so you have b-boys g-girls t-students
    you know g+124=b g=b-124 t=g+b
    you have
    11 boys ...... 9girls
    b boys ...... g girls
    then simply apply the rule
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    (Original post by lolu123)
    At a school
    number of boys:number of girls =11:9
    there are 124 more boys than girls
    work out the total number of students at the school
    The easiest way to do this is to realise that 11-9 = 2 so two "parts" of the ratio represent how many more boys there are than girls.

    So 2 parts = 124.
    Then 1 part = 62

    etc.

    Does this help?
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    (Original post by Notnek)
    The easiest way to do this is to realise that 11-9 = 2 so two "parts" of the ratio represent how many more boys there are than girls.

    So 2 parts = 124.
    Then 1 part = 62

    etc.

    Does this help?
    no
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    (Original post by lolu123)
    no
    If 1 part = 62 students
    Then the total 20 parts = 62*20 = 1240 students <-- Total number of students in the school.
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    What the question's ratio tells us is that there for every 20 students (it's an 11:9 ratio so there's 20 parts to it) that 11 are boys and 9 are girls. In the school as a whole, there are 124 more boys than girls. That means that this extra difference of 2 parts (11 boys - 9 girls means 2 more boys per 20) refers to 124 boys. That means that if 2 parts extra boys is 124 (can be written as 2x = 124) then 1 part extra boys is just half of that (simple algebra, x = 124/2 = 62). Then since you know the school has 20 parts, you multiply the singular part, which we referred to as x, by 20 (20x = 1240) to get the total number of students for every part which is the total number of students.
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    11 boys to every 9 girls.
    124 more boys then girls:
    Boys(11/20) = 124 + Girls(9/20)
    Therefore 11/20 - 9/20 = 124
    This leads to 2/20 = 124 therefore 1/20 = 62

    Girls = 9/20 = 62 x 9 = 558 Girls.
    Boys = 11/20 = 62 x 11 =682 Boys
    Therefore total students = 558 + 682 = 1240
    Hope this helps
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    (Original post by lolu123)
    At a school
    number of boys:number of girls =11:9
    there are 124 more boys than girls
    work out the total number of students at the school
    the ratio is 11:9 that's a difference of 2 and there are 124 more girls than boys so 124/2 = 62

    62x11 =682 and 62*9 = 558

    682 + 558 = 1240
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    (Original post by Zalvager)
    11 boys to every 9 girls.
    124 more boys then girls:
    Boys(11/20) = 124 + Girls(9/20)
    Therefore 11/20 - 9/20 = 124
    This leads to 2/20 = 124 therefore 1/20 = 62

    Girls = 9/20 = 62 x 9 = 558 Girls.
    Boys = 11/20 = 62 x 11 =682 Boys
    Therefore total students = 558 + 682 = 1240
    Hope this helps
    thanks
 
 
 
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