When it's bad luck to meet a black cat?

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

How can a man go eight days without sleep?

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

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

Find the number of squares in the below picture

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Mother's Name is Mrs. SIXTY TWO
Son's Name is FIFTY TWO
Daughter's Name is FORTY TWO
What is Name of Father?

Three friends decide to distribute the soda cans they had among them. When all of them had drunk four cans each, the total number of cans that remained was equal to the cans each one of them had after they had divided the cans.

Can you calculate the total number of cans before distribution?