math

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mrs.wheelbarrow weasel is less than 100 years old.her year of birth is divisible by 23 and 17, as well as by one other prime number less than 30.when was mrs.wheelbarrow weasel born?if she was still alive,how old would she be this year?(2007)

  • math -

    Since her year of birth must be divisible by both 23 and 17, it must be divisible by 391, (23 x 17)
    Since she is less than 100 she must have been born in the 19hundreds.

    So her birth year must be a multiple of 361, it is easy to just try a few multipliers by 361 and I got 1955 = 5*391

    Notice that 1955 is only divisible by the primes 5,17, and 23

    So if she was born in 1955, then in 2007 she would be 52

  • math -

    "So her birth year must be a multiple of 361, it is easy to just try a few multipliers by 361 and I got 1955 = 5*391 "

    should have been:

    So her birth year must be a multiple of 391, it is easy to just try a few multipliers by 391 and I got 1955 = 5*391

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