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?
assistant
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