Can you solve the photo plexer logic ?

what does the below math rebus puzzle mean?

If,

Akriti = 631
Levis = 521
Sroti = 521
Aneel = 533
Then,
Sunil =?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Can you make a six-letter word using the letters N, A and B ?

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

What number when divided in half becomes zero?

You are given 16 witch hats. The hats are divided in four different colours – red, blue, green and yellow. Every colour has been assigned to four hats. Now each of the hat will be glued with a label of an arithmetic sign – ‘+’, ‘-‘, ‘x’ or ‘/’. But you can label one sign only once on one colour. In such an arrangement, the hats can be uniquely defined by its colour and symbol.

Can you arrange all the 16 hats in a 4x4 grid in a fashion that no two rows and columns have a repetition of colour or sign?
We have arranged four hats in the below picture to assist you.