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?
Ruins:220(.40)=88.
Unmanned:88/2=
<gadget id="calculator">88/2</gadget>
<output>44</output>
44 castles.

<result>44</result>