i'm confused with your question, first of all it seems that your statement is missing a little details, like how many dogs she's walking? but if that's not the case and your teacher tells you that you can put any number of dogs then here's the equation.
a-number of dogs
b-number of how much she earns
c-number of times she does this
3×5×2=30 -jane earns 30 dollars just by walking 3 dogs on the weekends.
it depend on how much the root prize of all items and how much is the prize you added on it.
clear your question like add the original value of item and the value on how much you sold it.
meter (m) and 25 m are cut
ex off from a piece