Can someone please explain weighted averages to me in easy language?

Sorry. I'm not very mathematically inclined, and the complicated, wordy definitions I found in my research gave me headaches. I'm a much more artistic person, so if you could give me a visual wording (an example that gives me a picture in my mind -- f.e., "Bob had three oranges. His mother took two from him. How many oranges did Bob have left?") that'd be very helpful. If not, just keep it simple with no long words. Thanks! :)