Why do we preferably have round manhole covers and not square ones?

Complete the table series riddle by finding the number that can replace "??".

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

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

I have branches, but no fruit, trunk or leaves. What am I?

Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?

5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____

Below rebus represent famous DiCaprio movie. Can you name it?

Manish and Manoj play 5 games of chess.
Both Manish and Manoj win the exact same number of games. There is no tie at all.

How?

Replace The Question Mark Below With the Correct Number.

2 {38} 3
4 {1524} 5
6 {3548} 7
8 {????} 9

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?