Which number should replace the question mark?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

A sundial has the fewest moving parts of any timepiece. Which has the most?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Can you count the number of squares in the given picture?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Count the Triangle in the figure given below:

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your

What part of Turkey has the most feathers?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?