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

A Car driver was heading down a street in Washington. He went right past a stop sign without stopping, he turned left where there was a 'no left turn' sign and he went the wrong way on a one-way street. Then he went on the right side of the road past a cop car. Still, he didn't break any traffic laws. Why not?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Can you decipher the two rows to find the hidden word?

They are three errirs in this question. Can you find them?

ENEMY = 2 * LINK
LINK + 2 = HELL

Then what will be TAXI + HELL? Select from the options below:
a) ROTTEN
b) DANGER
c) HEAVEN
4) MORTAL

Count the Triangle in the figure given below:

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

When monkey rotate the gear, which mark will be hit 1 or 2 ?