Next, Mahmoud and Miriam found the pistachios, advertised at "5 pounds for $12." In dollars, how much greater is the price per pound of pistachios than the price per pound of walnuts?

The standard distance between studs in a house is 1.5 feet. if you have a set of blueprints for a house that mark every 1.5 feet with 2 in., by how many inches will a 13-foot wall be represented?

Precalculus question, image attached.

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 $s$?