A square snow fort contains 40 children.There are 3 defensive positions along each fort wall (8 total).
They have vowed to defend their fort against the adults in a snow ball fight. Once someone is hit with a snowball, they are out of the game. 
The fort's leader has determined the best defense requires 11 children along each wall. He organizes the children into the formation pictured.
How do they maintain 11 defenders along each wall side, as the fort's garrison dwindles with each snow ball assault, when there are...
- 36 children left?
- 32 children left?
- 28 children left?
- 24 children left?
- 22 children left?
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