Subnetting (Computer Networks)

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Given the network address as : 193.12.111.0 and subnet mask as: 255.255.255.224 . <br style="font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 14px; "><br style="font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 14px; "># how to calculate the Total Subnet ?<br style="font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 14px; ">#How many unusable host/Subnet?<br style="font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 14px; ">#What is the IP address of : 193.12.111.109 -usable subnet and usable host ?