Lying

Logic Level 1

Mina always tell lies on Monday, Tuesday, Wednesday. The other day while Mina does not tell lies. Tina also tell lies on Thursday, Friday, Saturday. The other day while Tina also does not tell lies. When do they say "I'm going to tell lies tomorrow" ?

Friday Sunday Monday Wednesday

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Allm Nurdiansyah by ALlm Nurdiansyah , 23, Indonesia

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2 solutions

Alex Vlasto
Aug 4, 2014

Mina lies on Wednesdays, but not on Thursdays. Tina tells the truth on Wednesdays, but lies on Thursdays. That way, If Mina says that she will lie the next day on a Wednesday, she is already lying. If Tina says that she will lie the next day on a Wednesday, then she is telling the truth, and therefore lying the next day. It is the only way that they can overlap. Poorly worded question though.

5 Helpful 0 Interesting 0 Brilliant 0 Confused
Leonblum Iznotded
Jul 25, 2018

Solution found by creating an array (days of the week X persons) : Lie / True in each case.

"I'm going to tell lies tomorrow" is verified for 1 person when "Lie" today and "true" tomorrow, XOR ["true" today" and "lie" tomorrow] (XOR = exclusively or, only these 2 cases).

This is both verified on wednesday : Mina Lies on W''day and Truth-makes on Th-day ; Tina Truth-makes on W-day and Lies on Th-day (the day after W''day). other days do not verify.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

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