<human>:  There are 220 castles in Scotland. 40 percent of them are ruins, and half of the ruined castles are unmanned. How many unmanned ruined castles are there in Scotland?
<bot>: How many ruined castles are there? ** Ruins:220(.40)=88
How many unmanned ruined castles are there? ** Unmanned:88/2=<<88/2=44>>44 castles
#### 44