Math problem puzzle

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Solution 1

Assuming $x, y,\text{ and } z$ are the ages of your grandson, your son, and you respectively, expressed in years, then your system is:

$$365x = 52y$$ $$12x=z$$ $$x+y+z=120$$

Therefore $x=6$, $y=42$ and $z=72$

Solution 2

Your son is $7$ times as old as your grandson. You are $12$ times as old as your grandson. Therefore if you let $x$ denote the age of your grandson, you have $$x + 7x + 12x =20x = 120$$ It follows that your grandson is $6$ years old, your son is $42$ years old and you are $72$ years old.

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Manal
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I love Algebra ! Geometry , my only problem is i can't focus on solving equations problems

Updated on August 15, 2022

Comments

  • Manal
    Manal 8 minutes

    My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

    It's really simple : The above system of 3 equations in 3 unknowns can be solved as follows.

    I know the solution should i write it ?

    • Guy
      Guy over 8 years
      if you know the answer why post this question? this isn't very interesting either. then why?
    • Manal
      Manal over 8 years
      I thought i have the right to post a question that i already know the answer of it
    • Guy
      Guy over 8 years
      I guess you do, but the convention is that you only post a question when you need help, or when you think that posting this question will help someone else, i.e, add value to the community. this is neither.