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Maths (O) Paper One

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Comments

  • #62
    Africa
    Registered Users, Registered Users 2 Posts: 1,252 ✭✭✭Africa


    how did you manage that?


  • #63
    Creamy Goodness
    Registered Users, Registered Users 2 Posts: 26,449 ✭✭✭✭Creamy Goodness


    <Jonny> wrote:
    Did anyone else get loads of decimals in the ratio question?

    Mine all totted up to 324.999999999999999999999999999999999999999999999999999999999999999999999999999

    instead of 325. What the hell.
    jonny, no I didn't get the decimals.

    this is how I done that question which I think worked out perfectly.

    1/3 : 1/3 : 1/4 use the common denominator - 12 - to get whole numbers so
    6/12 : 4/12 : 3/12 disregard the 12's so you get
    6 : 4 : 3 which add up to 13

    divide 325 by 13 = 25
    25 * 6 = 150 first portion
    25 * 4 = 100 second portion
    25 * 3 = 75 third portion

    to check the answer you add 150 + 100 + 75 = 325


  • #64
    Closed Accounts Posts: 311 ✭✭<Jonny>


    Well, I'll get most of the attempt marks. Damn.


  • #65
    Johnerr
    Registered Users, Registered Users 2 Posts: 239 ✭✭Johnerr


    <Jonny> wrote:
    Did anyone else get loads of decimals in the ratio question?

    Mine all totted up to 324.999999999999999999999999999999999999999999999999999999999999999999999999999

    instead of 325. What the hell.

    yea i got that, tinks it's worng but, it still adds up to 325 so it's got to be right.


  • #66
    JohnCleary
    Registered Users, Registered Users 2 Posts: 10,207 ✭✭✭✭JohnCleary


    cessy wrote:
    was the population ans not 52150 cuz it was a 16%inc so 16=8344 blah blah blah

    I hope so cause thats the answer I got!!


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  • #67
    Cherry_Pie
    Closed Accounts Posts: 176 ✭✭Cherry_Pie


    I got 50,000 and redid it at home and its def 50,000!!


  • #68
    Cool_CM
    Registered Users, Registered Users 2 Posts: 5,000 ✭✭✭Cool_CM


    JohnCleary wrote:
    I hope so cause thats the answer I got!!
    i did the same, unfortunately it looks like it was some wierd compound interest type question except with population.
    That paper was a c***, no 2 ways about it..........


  • #69
    Vikings
    Registered Users, Registered Users 2 Posts: 2,783 ✭✭✭Vikings


    For that ratio one I messed it up to no ends. I never even noticed about the 12 lcm, and instead changed them to decimals, and multiplied by a hundred, got 50,33,25. Then they all added up to 325 (with some tinkering ;))


  • #70
    Petal
    Closed Accounts Posts: 166 ✭✭Petal


    I just realised I got question 2 part c right.. I think.. but for the love of god I can't remember how I did it.. Usually the way it goes in maths..


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