P3 Maths question

Discussion in 'Primary School Registration and Academic' started by Gladys, Mar 17, 2010.

  1. Gladys

    Gladys Member

    Hi,

    Anyone can help me solve this problem sum. Can use model to solve this type of sum. How to interpret it? Thank you so much.


    Mr Lim is five times as old as Philip. He is 52 years older than Philip. How old will Philip be in 8 years' time? Ans : 21 years
     
  2. stonston

    stonston Well-Known Member

    This is a very simple & straightforward question.
    Going out now. Hard to post the model with iPhone. Will reply later.
     
  3. RamblingMummy

    RamblingMummy Member

    Mr Lim: 5 units
    Philip: 1 unit
    (as Mr Lim is 5times as old as Philip)

    Difference--> 5units - 1 unit
    = 4 units
    4 units --> 52 years old (as Mr Lim is years older than Philip)
    1 unit --> 52/4
    = 13 years old (which is also Philip's age now as he only has 1 unit)
    In 8 yrs' time, Philip will be --> 13 + 8
    =21 years old.

    Drawing models will make it clearer :)
     
    Gladys likes this.
  4. Gladys

    Gladys Member


    Paiseh.. I am getting old. Think very long still but cannot get the working. Thanks for the working.
     
  5. stonston

    stonston Well-Known Member

    Mr Lim is five times as old as Philip. He is 52 years older than Philip. How old will Philip be in 8 years' time? Ans : 21 years

    NOW:
    As Mr Lim is 5 times as old as Philip, Mr Lim will have 5 units and Philip will have 1 unit:
    Mr Lim [=][=][=][=][=]
    Philip `[=]

    Mr Lim is 52 years older than Philip (difference between Mr Lim and Philip is 52 years):
    Mr Lim [=][=][=][=][=]
    Philip `[=]<----52--->

    So, 4 units = 52 years
    1 unit = 52/4 = 13 years

    Philip is 13 years old now.

    In 8 year's time means 8 years later.
    So,
    13 + 8 = 21
    Philip will be 21 years old in 8 year's time.
     
    Gladys likes this.

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