Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

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

Can you find a number that lies one third of the distance between 1/3 and 2/3?

How many triangles do you see in the picture puzzle below?

Daniel walks into a movie theatre. While in the movie, he suddenly smiles delightfully. About a couple of minutes later, he seems shocked. He walks out of the theatre, goes to a bridge and jumps over the edge killing himself.

Why did he do it?

Note: Think Lateral

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

There are three boxes of different sizes with three cupcakes inside each of the boxes in Christina's kitchen. At night her daughter wakes up and goes to the kitchen. She opens a box and eats all three cakes.

But in the morning Christina finds out that each box still had three cupcakes. How?

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?