Back with another question that obviously shows I know nothing...

About how much yeast is in a package? The recipes I have say use 1 or
2 packages of yeast, but I dont' recall an actual measurment. I don't
have prepackaged yeast, I have a jar/bottle thign of it in my fridge.
Yes, I already know to let it get to room temp before using it, but
not sure how much would consist of a package.

Thanks in advance for the answer.

Cadie