22. Mowgli asked a snake and a tiger what day it was. The snake always lies on Monday, Tuesday and Wednesday but tells the truth otherwise. The tiger always lies on Thursday, Friday and Saturday but tells the truth otherwise. The snake said "Yesterday was one of my lying days". The tiger also said "Yesterday was one of my lying days". What day of the week was it?
A Thursday
B Friday
C Saturday
D Sunday
E Monday
Solution
A

The snake would only say "Yesterday was one of my lying days" on Monday, when it would be a lie and on Thursday, when it would be the truth. Similarly, the tiger would only say "Yesterday was one of my lying days" on Thursday, when it would be a lie, and on Sunday, when it would be the truth. Hence, since both said this, it was Thursday.