Posted by karen on Tuesday, February 23, 2010 at 7:59pm.
i am thinking of a number between 20 and 50. it is an even number. it has exactly 9 factors. what is the number?

math  MathMate, Tuesday, February 23, 2010 at 8:35pm
If it has exactly 9 factors, it must be a perfect square, as only perfect squares have an odd number of factors (including 1 and the number itself).
Between 20 and 50, there are 3 perfect squares, only one of which has more than three factors.
Post if further help is required.
Answer This Question
Related Questions
 math  Eduardo thinks of a number between 1 and 20 that has exactly 5 factors. ...
 MATH HELP  Eduardo thinks of a number between 1 and 20 that has exactly 5 ...
 math  Eduardo thinks of a number between 1 and 20 that has exactly 5 factors. ...
 math  Eduardo thinks of a number between 1 and 20 that has exactly 5 factors . ...
 math problem solving  Eduardo thinks of a number between 1 and 20 that has ...
 math  I'm thinking of a number made from the digits 3,6 and 9. Each digit is ...
 Math  Elisa think about a number between 10 and 20 that has exactly 2 factor. ...
 math  what if Julie is thinking of an even number between 12 and 29 with digits...
 math  julie is thinking of an even number between 12 and 29 with digits whose ...
 math  What if Julie is thinking of an even number between 12 and 29with digits ...
More Related Questions