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Math Help - Percentages

  1. #1
    Newbie
    Joined
    Apr 2010
    Posts
    11

    Percentages

    I've got a maths exam next week and i need to know how to work this question out for my revision so please could u show me:

    Kate asked people if they read a daily newspaper.
    Then she wrote this table to show her results:

    No
    80 people = 40 %
    Yes
    126 people = 60 %

    The values in this table cannot all be correct.

    (a) The error could be in the number of people. Complete each table to show what the correct numbers could be.

    No
    80 people = 40 %
    Yes
    ......... people = 60 %

    No
    ....... people = 40 %
    Yes
    126 people = 60 %


    (b) The error could be in the percentages. Complete the table with the correct percentages.

    No
    80 people = .......... %
    Yes
    126 people = ......... %



    Please could you show your working.
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  2. #2
    Junior Member slovakiamaths's Avatar
    Joined
    Apr 2010
    From
    India
    Posts
    41

    Thumbs up

    Ans: (a)
    No
    80 people = 40 %
    Yes
    .....120.... people = 60 %

    No
    ...84.... people = 40 %
    Yes
    126 people = 60 %

    Ans: (b)
    No
    80 people = ..38.83........ %
    Yes
    126 people = ..61.17....... %
    you may proceed to this sol as such
    let total people= x
    then x*40%=80
    x=80*(100/40)
    x=200
    now 200-80=120
    (b) for this part proceed as follow:
    126+80=206
    now (80/206)*100=38.83%
    and (126/206)*100=61.17%
    good luck
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