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pratu043

Four bells first begin to toll together and then at intervals of 6, 7, 8 and 9 seconds respectively. Find how many times the bells toll together in two hours and at what intervals they toll together?

  • one year ago
  • one year ago

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  1. sauravshakya
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    First find L.C.M of 6,7,8 and9

    • one year ago
  2. pratu043
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    ok. 504.

    • one year ago
  3. sauravshakya
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    Are u sure

    • one year ago
  4. sauravshakya
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    ya... thats right

    • one year ago
  5. sauravshakya
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    So, the four bells will ring afer 540 seconds all together

    • one year ago
  6. sauravshakya
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    got it?

    • one year ago
  7. pratu043
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    504.

    • one year ago
  8. sauravshakya
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    now, 2 hour = ---- seconds

    • one year ago
  9. pratu043
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    But it says they ring together at intervals of 6, 7, 8, 9 seconds.

    • one year ago
  10. pratu043
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    So what have these numbers got to do with 504?

    • one year ago
  11. sauravshakya
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    Since the Four bells first begin to toll together and then at intervals of 6, 7, 8 and 9 seconds respectively

    • one year ago
  12. sauravshakya
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    they will ring together after 540 seconds now

    • one year ago
  13. sauravshakya
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    PLZ read the question carefully

    • one year ago
  14. pratu043
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    So after that nine seconds, they will ring together after 504 seconds?

    • one year ago
  15. sauravshakya
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    nope.....

    • one year ago
  16. pratu043
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    Lets say they ring together first at 6.00.00. Then at 6.00.06 6.00.07 6.00.08 6.00.09 right?

    • one year ago
  17. sauravshakya
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    nope.....

    • one year ago
  18. sauravshakya
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    Let me first expalin the question

    • one year ago
  19. sauravshakya
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    there are four bells|dw:1344785837617:dw|

    • one year ago
  20. sauravshakya
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    which ring together at first

    • one year ago
  21. sauravshakya
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    then BELL A rings after 6 seconds, BELL B rings after 7 seconds , BELL C rings after 8 seconds and BELL D rings after 9 seconds

    • one year ago
  22. sauravshakya
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    got it?

    • one year ago
  23. pratu043
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    yep i got it now.

    • one year ago
  24. sauravshakya
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    so what do u think 540seconds means

    • one year ago
  25. pratu043
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    2 hours = 2 * 60 * 60 seconds = 3600 * 2 = 7200 seconds

    • one year ago
  26. pratu043
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    The three bells will ring TOGETHER every 504 seconds right?

    • one year ago
  27. sauravshakya
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    right

    • one year ago
  28. pratu043
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    OK, I know how to do it now. Thanks!!

    • one year ago
  29. sauravshakya
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    WELCOMX

    • one year ago
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