Posted by gary on Sunday, September 12, 2010 at 10:54pm.
what is my number?
Clue 1 My number is a multiple of 5,but it does not end in 5.
- Multiples of 5 end in "5" and which other digit?
- Can you identify 2 prime factors if the number ends in this digit?
Clue 2 The prime factorization of my number is a string of three numbers.
- From clue 1, we have already found two of the three prime factors. We need the third one.
Clue 3 Two of the numbers in the prime factorizations are the same.
- Therefore the third one must be a duplicate of one of the other two.
- that leaves us two choices.
Clue 4 My number is greater than the seventh square number.
- out of the two choices, which one will make a number greater than 7²?
kjljjjudeljh
?
30
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