Posted by
christian on
.
double my tens digit to get my ones digit. double me and i am less than 50

math 
MathMate,
If the tens digit is 1, the units digit is 2. The number is then 12, less than 50.
There is another tens digit that fit the bill, and will result in another number that when doubled, is still less than 50.
Can you find the other digit, and the associated number?

math 
mac,
21?