While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

What does the below image rebus riddle means ?

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 ?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?