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sws._.

Christopher is 4 times as old as Michael. Ten years ago, Christopher was 9 times as old as Michael.How old is Christopher now?

  • one year ago
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  1. sauravshakya
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    Let the present age of Christopher and Michael be x and y then, x=4y ........i x-10 = 9(y-10) .....ii

    • one year ago
  2. sauravshakya
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    Solve that two equations

    • one year ago
  3. sws._.
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    for x in the second equation do I put 4y? so the equation would look like 4y-10=9(y-10) ?

    • one year ago
  4. sauravshakya
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    Yep....... Now solve for y

    • one year ago
  5. sws._.
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    okay

    • one year ago
  6. sauravshakya
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    Then plug the value of y u get in eqn i to find x

    • one year ago
  7. sws._.
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    when i was solving the equation with the y i distributed and got 4y-10=9y-90

    • one year ago
  8. sws._.
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    then after that i added 9y to 4y

    • one year ago
  9. sws._.
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    and got 13y

    • one year ago
  10. sauravshakya
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    4y-10=9y-90 -10+90=9y-4y

    • one year ago
  11. sauravshakya
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    got your mistake?

    • one year ago
  12. sws._.
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    ohhh

    • one year ago
  13. sws._.
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    yes i did

    • one year ago
  14. sauravshakya
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    So, what is the value of y

    • one year ago
  15. sws._.
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    16?

    • one year ago
  16. sauravshakya
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    YES

    • one year ago
  17. sauravshakya
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    Now what is the value of x then

    • one year ago
  18. sws._.
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    64?

    • one year ago
  19. sauravshakya
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    Very correct

    • one year ago
  20. sws._.
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    okay :) thank you

    • one year ago
  21. sauravshakya
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    WELCOME

    • one year ago
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