What is full of holes but still holds water?

Why do we preferably have round manhole covers and not square ones?

There are hundred red gems and hundred blue gems. The blue gems are priceless while the red gems equal wastage. You have two sacks one labeled Heads and the other Tails. You have to distribute the gems as you want in the two sacks. Then a coin will be flipped and you will be asked to pick up a gem randomly from the corresponding sacks.

How will you distribute the gems between the sacks so that the odds of picking a Blue gem are maximum?

The Judge knows that Alamgir was killed by his girlfriend Jasline, but the judge is unsure whether to punish her. Why?

Count the number of triangles in the picture below:

A man dies of old age on his 25 birthday. How is this possible?

Buy me, smell me or deliver me, I do not change.

Who am I?

Can you count the number of triangles in the given figure?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Which fur should we be getting from the Lion?