Why is 6 afraid of 7?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

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

What can jump higher than a building?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

This is a famous paradox which has caused a great deal of argument and disbelief from many who cannot accept the correct answer. Four balls are placed in a hat. One is white, one is blue and the other two are red. The bag is shaken and someone draws two balls from the hat. He looks at the two balls and announces that at least one of them is red. What are the chances that the other ball he has drawn out is also red?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?