I found that drawing the circles for the subsets and supersets make it much easier to understand.

The tacos I was planning on eating later are gone from the fridge and the box is in the trash can. My brother is in the kitchen washing a dish with pieces of onion and cilantro. His shirt is also stained with the red salsa that were in the box with my tacos. I can hypothesize that he ate my tacos.

Members of the gym can now access the reservation system. In order to gain access to the reservation system members must pass a fitness test. The only other way to gain access to the reservation system is to go to the gym 6 times a week. George has access to the reservation system. George has never done a fitness test in his life. Therefore George must go to the gym at least 6 times a week.

Not every teacher, teach for the money. After all some teachers really care about the youth and want to help them succeed.