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