Can you place three balls such that the equation shown in the picture holds true?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

There is a five-letter word which has 3 consonants(all are same) and 2 different vowels.
Also, something wrong is associated with the word.

Can you name it?

What is full of holes but still holds water?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

I have Rs.50 and I spend it in the way as below.

Find out which of the given views in the picture is accurately the top view of the given pyramid.

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

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

What does this rebus riddle mean?