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

Can you name some countries which do not have the alphabet 'A' in them?

On a magical land of Mexico , all the animal in the land are rational.

There are 10 tigers and one goat.
Tiger can eat goat but since it's a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).

If we leave them for some time then how many goat and tiger will be there , when we come back ?

There is something which you can be arrested for attempting but not for successfully completing.

You can win me and lose me but never buy me
You can not eat me and never want to part with me
I can make you cry or bring you joy
I am not a machine and definitely not a toy
You keep me but i am not forever just yours
You might find me in a case or on a shelf next to a vase
I am hard and i am tall if you bump me i am sure to fall
I am made of different materials and am at many events
If your lucky and fight hard I might be yours
What am I ?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

What does the below rebus riddle means?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

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

Who am I?

Rectify the following equality 101 - 102 = 1 by moving just one digit.