Hillary, Meredith, and Aly are sitting in their favorite coffee shop when their waiter asks: "Does everyone want coffee?" Hillar
y replies "I don't know." Meredith then replies "I don't know" as well. Finally, Aly says "Not everyone wants coffee." The waiter comes back and gives a coffee to each person that wants one. Answer the following question:
(a) Did Hillary get a coffee?
(b) Did meredith get a coffee?
Meredith and Hillary both want coffe, but they don't know if the other two people do, therefore they can't know if everyone want coffee. If they didn't want coffee, their answer would have been just "no".
Aly knows that she doesn't want coffee, therefore she knows that not everyone wants coffee.
