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10 August, 06:11

Winnie write the following riddle. I am a number between 60 and 100. My ones digit is teo less than my trns digit. I am a prime number. Winnie's friend Marci guessed that her riddle was about the number 79. Why can't 79 be the answer to Winnie's riddle?

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  1. 10 August, 06:21
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    The criteria is

    Between 60 & 100

    Units digit 2 less than tens

    Prime number

    79 is a number between 60 & 100 and it is a prime number (as its only factors are 1 and itself), however 79 has a tens digit that is 2 less than the units - not the units 2 less than the tens.

    As it does not comply with one of the rules the number cannot be 79

    The number that would work is 97
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