This trouble already has over 175,000 shares on Facebook. Can you solve it?

"If Teresa'due south daughter is my daughter's mother, then what is my relationship to Teresa?"

a. her grandmother
b. her mother
c. her daughter
d. her granddaughter
e. I am Teresa

Requite it a try and watch the video for an caption of the answer.

Answer to Teresa's daughter is my daughter's female parent – viral Facebook logic puzzle

Gyre below for a text/image summary.
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"All volition be well if you use your mind for your decisions, and mind only your decisions." Since 2007, I have devoted my life to sharing the joy of game theory and mathematics. MindYourDecisions now has over 1,000 free articles with no ads thanks to community support! Aid out and go early access to posts with a pledge on Patreon.

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Answer To: Teresa's daughter is my daughter's mother

The answer is (c) her daughter. Let me explain why.

In a family unit tree we take Teresa, then i level down is her daughter, who is also the mother of the narrator'due south daughter which is ii levels down.

teresas-daughter-puzzle-1

The narrator is 1 level down from Teresa, or at the same level of Teresa's daughter. Note that four of the answer choices are at different levels relative to Teresa:

a. her grandmother – two levels up
b. her mother – ane level up
d. her granddaughter – two levels down
due east. I am Teresa – same level

teresas-daughter-puzzle-2

The intuitive respond is Teresa's son-in-law, who would be married to Teresa'south girl and one level down from Teresa. Notwithstanding, this is non an answer selection.

The narrator has to be on the same level as Teresa's daughter, and therefore the respond is (c) Teresa's girl.

teresas-daughter-puzzle-3

Sources

Kennedy Jones Facebook folio diction "If Teresa's daughter is my daughter's mother, what am i to Teresa?"
https://www.facebook.com/kennedyjones/photos/a.364635850291302.90166.362691427152411/945923912162490/?type=3

This puzzle seems to have been effectually for a while. I cannot trace its exact origins, only I am able to find information technology in the 1985 publication "The Book of Tests" using the name Barbara.
https://books.google.com/books?id=cZ0QAQAAIAAJ&dq=barbara%27s+girl+is+my+daughter%27s+mother&focus=searchwithinvolume&q=barbara

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