How many words can a pen with half refill write?

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

Solve this tricky question. You are trapped in a forest. With you, you have a gun preloaded with two bullets in it. In front of you, there is a tiger, a leopard and a jaguar.

How do you survive?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

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

Move four matchsticks to the below square to form three squares?

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?