84
All of the composite numbers less than 100 have factor pairs.
Numbers less than 100 having 19 as a factor are 19, 38, 57, 76, and 95.
48 is a possibility
When they have a factor in common greater than one.
80 has 5 factor pairs.
92
1 has 1 factor.
Any multiple of 10.
There are 80 such integers.
30, 60 or 90
It is always less than 1 or 100%.It is always less than 1 or 100%.It is always less than 1 or 100%.It is always less than 1 or 100%.
25