Can you count the number of blocks in the picture below?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

Count the Triangle in the figure given below:

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

What does this rebus means ?

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

What occurs twice in a week, once in a year but never in a day?

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