They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Can you count the number of triangles in the picture below?

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

Using eight eights and addition only, can you make 1000?

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

Which is Odd One Out and why?

4377

3954

9862

8454

9831

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

The King of a distant land had heard that Birbal was one of the wisest men in the East and so desired to meet Birbal. He sent Birbal an invitation to visit his country.

In due course, Birbal arrived in the distant kingdom. When he entered the palace he was flabbergasted to find not one but six kings seated there. All looked alike. All were dressed in kingly robes. Who was the real king?

The very next moment he got his answer. Confidently, he approached the king and bowed to him.

How did Birbal know who was the real king?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?