Two plus Eleven is One

When can we add 2 to 11 and get 1 as the correct answer?




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Sweet & very intelligent katty has 8 puppets(Jane Bird Barbie Angel Colleen Nora Lass Missy).
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* Mr Danny lives in the fourth house, while the first house is not made from red marble.

Who lives where, and what is their house made from?

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