What does this rebus puzzle means ?

Which is heavier: a ton of bricks or a ton of feathers?

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?

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

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

Which is the rope you never skip with?

What does this rebus means ?

What has lots of eyes, but can’t see?

There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.

Can you calculate the dimensions of this box with the given data?

Can you make the below equation true by using any three numbers from "1, 3, 5, 7, 9, 11, 13 and 15"?

( ) + ( ) + ( ) = 30