let's say the total population at Danger Glen is "a".
at 8am, two sheeps get eaten.
at 12pm, two snakes get crushed.
at 6pm, two wolves get bitten.
so from 8am - 6pm everyday, 6 residents of Danger Glen get subtracted.
Day 1.............8am - 6pm.............. a - 6
Day 2.............8am - 6pm.............. a - 6 - 6
Day 3.............8am - 6pm.............. a - 6 - 6 - 6
Day 4.............8am - 6pm.............. a - 6 - 6 - 6 - 6
Day 5.............8am - 6pm.............. a - 6 - 6 - 6 - 6 - 6
Day 6.............6am, is not 8am yet, so any sheeps are fine, but there's only 1 resident left, a wolf, what the?
[tex]\bf a\stackrel{\textit{5 days of subtractions}}{- 6 - 6 - 6 - 6 - 6 }=\stackrel{\textit{one wolf}}{1}\implies a-30=1\implies a=31[/tex]
