How is the moon similar to a dollar?

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Why did the Girl throw the butter out of the window?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

What is the next number in the series?

15 29 56 108 208 ?

In the figure, you can see nine stars. What you have to do is connect all of them by using just four line and without lifting your hand i.e. in a continuous flow.

Cristina was born in 1888. She just had her 30th birthday today how did that happen?