I am lying and I always lie. Tell me whether I am lying or telling the truth.

A man dies of old age on his 25 birthday. How is this possible?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

Can you find out who is the kidnapper in below Picture and why, Explain ?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

I shave every day, but my beard stays the same. What am I?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?