Hello User :)
How are you doing?
In this case, your trying to find how many calls he makes per minute. So here we go! We know he made 15 calls in 20 minutes! Therefore, we must divide to find the unit number, which basically is "Numbers Simplified."
[tex]15 / 20=0.75[/tex]
That means he makes 0.75th of a call in 1 minute.
