By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

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.

Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

Count the number of lines in the image below ?