What four weights can be used to balance from 1 to 30 pounds?

Solve the mathematical equation in the picture below.

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

What is next number in the pattern below:

131 517 192 123 ?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

What month of the year has 28 days?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Find the number of squares in the below-given picture.

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

On a charity event in Russia, Murray beat Djokovic by winning six games and losing three games.
Note: There is a total of 5 service breaks(one who serve lost the game).
Who served first, Djokovic or Murray?