Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

Replace the question mark with the number below given a simple math problem.

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Can you decipher the below rebus?

PBLUESAISNUERSES

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

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

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?