It is easy for a person to be hard hearted because most of the time human beings approach things defensively, the main reason is they are trying to protect themselves psychologically from getting heart. This makes us so receptive to people or things that we are familiar with as opposed to those things we aren't familiar with.
I think it's the culture/genes they were brought/born into. Because it can be genetically made into your DNA or you might be raised in that certain household/culture that you're used to.
What is the question. for real
Answer:
The HCF of 15 and 30 is 15
15=3×5
30=2×3×5
common factor=3×5
=15
Umm.. Hi in Portuguese is “Oi”
