Prove that twice of ten is the same as twice of eleven.

Can anyone tell me a word in the English dictionary which has a silent 'z'?

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?

Find the 8 in the below-given Image.

How many triangles are there in the picture below?

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

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?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

Find the next number in the sequence

1, 2, 6, 21, 88, __?