Three playing cards are pulled out from an ordinary deck and placed face down in a horizontal row. To the right of a King there are one or two Queens. To the left of a Queen there are one or two Queens. To the left of a Heart there are one or two Spades. To the right of a Spade there are one or two Spades. What are the three cards and what order are they in?

ANSWER 

King of Spades (K♠) – Queen of Spades (Q♠) – Queen of Hearts (Q♥)

From the question above, you know these four things:

K  is left of Q or Q Q

Q or QQ is left of Q

♠ or ♠ ♠ is left of  ♥

♠ is left of  ♠ or  ♠♠

Two Queens have to be next to each other, and a King has to be to the left of a Queen.  Thus, the order has to be K – Q – Q.

Two Spades have to be next to each other, and a Heart has to be to the right of a Spade.  Thus, the order has to be ♠ – ♠ – ♥.

Put these together and you have K♠ – Q♠ – Q♥.

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