When could I use "between A to B"?
When could I use "between A to B"?
Some say it must be "between A and B", while other say "between A to B" could be possible to use."
I think both of them are right. What do you think?
I have also found out both of them from some example sentences..
But I'd like to hear what native English speakers think about it.

The examples I have seen.

1) The ratio of boys to girls is between 1.04 and 1.07.
That means there are between 104 to 107 male babies for every 100
female babies.

2) Between 60 to 70 percent of people who ask for our catalog and free
samples end up ordering from us.

I can somehow understand what these two sentences mean, but
I'd like to understand them specifically.
Thanks.

Question

When could I use "between A to B"?
When could I use "between A to B"? 
Some say it must be "between A and B", while other say "between A to B" could be possible to use." 
I think both of them are right. What do you think?
I have also found out both of them from some example sentences..
But I'd like to hear what native English speakers think about it.

The examples I have seen.

1) The ratio of boys to girls is between 1.04 and 1.07.
   That means there are between 104 to 107 male babies for every 100      
   female babies.

2) Between 60 to 70 percent of people who ask for our catalog and free  
    samples end up ordering from us.

I can somehow understand what these two sentences mean, but 
I'd like to understand them specifically.
Thanks.

Answer

"Between A to B" is 100% wrong!

The correct expression is either "from A to B" or "between A and B".

Answer

Between A to B is technically wrong, but like you say, we speak like that a lot. It happens because we change our minds mid sentence.
If you want to be bookish and correct you say:
between A and B
from A to B

Answer

Example:1.It is 20 km between City A and City B
2.It is 20 km from City A to City B.