Brain Teasers
Four Students
Four students, Nina, Joy, Annie and Bobby took a mathematics test, and were guessing their grades.
Nina says: "If I get an A, so does Joy."
Joy says: "If I get an A, so does Annie."
Annie says: "If I get an A, so does Bobby."
They all guessed correctly, but in fact, only two of them got an A. Who are they?
Nina says: "If I get an A, so does Joy."
Joy says: "If I get an A, so does Annie."
Annie says: "If I get an A, so does Bobby."
They all guessed correctly, but in fact, only two of them got an A. Who are they?
Answer
If Nina got an A, then all four students got an A, which contradicts the fact that only two got an A.If Joy got an A, then so did Annie and Bobby, and also contradicts.
Therefore, only Annie and Bobby got an A.
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