How do i solve operations with absolute value [10-11]-[15]

Out of $20$ creepy-crawly creatures in a room, $80\%$ are flies and $20\%$ are spiders. if $s\%$ of the total legs belong to spiders, what is $s$?

Jimmy can run 3.5 miles in 20 minutes. how far can ne run in one hour and ten minutes?

What is the area of the shaded sector?