Puzzle | The Lion and the Unicorn

A girl, Alice, is walking through a mysterious forest and meets two strange creatures: a lion and a unicorn.

Each of them has a fixed pattern of telling the truth or lying:

Lion:

• Lies on Monday, Tuesday, Wednesday
• Tells the truth on Thursday, Friday, Saturday, Sunday

Unicorn:

• Lies on Thursday, Friday, Saturday
• Tells the truth on Sunday, Monday, Tuesday, Wednesday

They make the following statements:

• Lion: “Yesterday I was lying.”
• Unicorn: “Yesterday I was lying."

Determine the day of the week on which Alice met them.

Check if you were right - full answer with solution below.

Solution:

Step 1: Analyze the Lion’s statement
If Lion's statement is :

True: Today is Thursday, as only in this case, Lion is telling truth today and was lying yesterday.

False: Today is Monday, as only in this case, Lion is lying today and was telling a truth yesterday.

Step 2: Analyze the Unicorn’s statement
If Unicorn's statement is :

True: Today is Sunday, as only in this case, Unicorn is telling truth today and was lying yesterday.

False: Today is Thursday, as only in this case, Unicorn is lying today and was telling a truth yesterday.

The day is Thursday and only this satisfied both the conditions.