Robert's Birthday

Logic Level 3

X and Y just became friends with Robert. They want to know his birthday. So, he gave them 10 possible dates to choose from.

May 15, May 16, May 19
June 17 ,June 18
July 14 July 16
August 14, August 15, August 18

Then Robert tells X and Y month and day of his birthday respectively.

X : I don't know his birthday but I know Y also doesn't know
Y : Earlier, I did not know, but now I know.
X : Now I know it too.

Assuming both X and Y are perfectly logical,When is Robert's Birthday?

May 15 August 14 July 16 June 17

Ansh Agrawal by Ansh Agrawal , 20, India

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1 solution

Davin Shaun
Apr 12, 2016

Correct answer is july 16, not 16

0 Helpful 0 Interesting 0 Brilliant 0 Confused

Thanks. We have made the relevant edits.

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Brilliant Mathematics Staff - 5 years, 2 months ago

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You guys are seriously fast.

Okay, sure. Sorry, wasn't aware. And yes I meant 'not 14', typo.

Davin Shaun - 5 years, 2 months ago

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