Help assignment of Linear Programming?

I was taught about Deterministic Operations Research by my lecturer this morning, and he gave me an assignment about linear programming. It goes like this :

Find an interesting problem that you have ever experienced in your real daily life, which may be formulated and solved using linear programming.
– Define the Decision Variables as clearly as possible!
– Formulate the problem into a complete LP!
– Solve the problem!

My problem is I just don’t have any idea how to do this assignment.. I don’t understand how to interpret these “problems” into a linear programming

Any advice on what I should do? Please give me a description or an example so that I could understand about it? thx

(fyi, I study industrial engineering)