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

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

It begins where the time ends.
Its second is an expression of surprise.
Its third is a question.
Its fourth is urinate.
It ends with a drink.

Which country it is?

Below rebus represent famous DiCaprio movie. Can you name it?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.