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    In a school there are 800 students

    3/10 of the total number of students are in year 7 and year 8 combined
    1/4 of the total number of students are in year 9
    The remaining students are in either year 10 or year 11 in Yh ratio 5:4

    What percentage of the pupils in the school are in year 11 ? ‪
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    (Original post by fentydrug)
    In a school there are 800 students

    3/10 of the total number of students are in year 7 and year 8 combined
    1/4 of the total number of students are in year 9
    The remaining students are in either year 10 or year 11 in Yh ratio 5:4

    What percentage of the pupils in the school are in year 11 ? ‪
    Number of students in year 7 and 8 = (3/10) * 800

    Number of students in year 9 = (1/4) * 800

    Number of students in year 10 and 11 = 800 - (number of students in year 7, 8 and 9)

    Ratio of year 10 to 11's is 5:4, so 4/9 of the remaining students are in year 11.

    You can find the number of students in year 7 and 8, and 9 to find the number of year 10s and 11s.

    Percentage of year 11s = (number of people in year 11 *100) / (Number of people in the whole school)
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    (Original post by Loci Pi)
    Number of students in year 7 and 8 = (3/10) * 800

    Number of students in year 9 = (1/4) * 800

    Number of students in year 10 and 11 = 800 - (number of students in year 7, 8 and 9)

    Ratio of year 10 to 11's is 5:4, so 4/9 of the remaining students are in year 11.

    You can find the number of students in year 7 and 8, and 9 to find the number of year 10s and 11s.
    I’m the worst at maths thank you
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    (Original post by fentydrug)
    I’m the worst at maths thank you
    No problem. Good luck with the question
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    (Original post by Loci Pi)
    No problem. Good luck with the question
    I got 53.3 recurring as the number of students in year 11?
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    (Original post by fentydrug)
    I got 53.3 recurring as the number of students in year 11?
    I got 160 as the number of students in year 11.

    Number of students in year 7 and 8:
    Spoiler:
    Show

    (3/10) * 800 = 240


    Number of students in year 9:
    Spoiler:
    Show

    (1/4) * 800 = 200


    Number of year 10s and 11s:
    Spoiler:
    Show

    800 - 240 - 200 = 360


    Number of students in year 11
    Spoiler:
    Show

    = (4/9) * 360 = 160


    If you post the working out that you did, you can compare them to these stages of working. There will have been a mistake somewhere if you do not get a whole number of students.
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    (Original post by Loci Pi)
    I got 160 as the number of students in year 11.

    Number of students in year 7 and 8:
    Spoiler:
    Show

    (3/10) * 800 = 240


    Number of students in year 9:
    Spoiler:
    Show

    (1/4) * 800 = 200


    Number of year 10s and 11s:
    Spoiler:
    Show

    800 - 240 - 200 = 360


    Number of students in year 11
    Spoiler:
    Show

    = (4/9) * 360 = 160


    If you post the working out that you did, you can compare them to these stages of working. There will have been a mistake somewhere if you do not get a whole number of students.
    yes thank you I stupidly added 240 Twice
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    (Original post by fentydrug)
    yes thank you I stupidly added 240 Twice
    Now you can use that to find the the % of students in year 11.
 
 
 
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