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

What has 88 keys?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

What is next number in the pattern below:

131 517 192 123 ?

Which number should replace the question mark?

An office is divided into 8 cubicles. How many of the cubicles are painted if only 1/8 of the cubicles are painted?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

10+10 and 11+11 can give you the same answer.

Explain how?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.