obvious." Since it's not obvious, we should practice with it a bit. In each of the cases, who has the absolute advantage at each task, and who has the comparative advantage?

a$.$ In $30$ minutes, Kana can either make miso soup or she can clean the kitchen. In $15$ minutes, Mitchell can make miso soup; it takes Mitchell an hour to clean the kitchen.

b$.$ In one hour, Ethan can bake $20$ cookies or lay the drywall for two rooms. In one hour, Sienna can bake $100$ cookies or lay the drywall for three rooms.

c$.$ Kara can build two glass sculptures per day or she can design two full$-$page newspaper advertisements per day. Sara can build one glass sculpture per day or design four fullpage newspaper ads per day.

d$.$ Data can write $12$ excellent poems per day or solve $100$ difficult physics problems per day. Riker can write one excellent poem per day or solve $0\mathrm{.}5$ difficult physics problems per day.