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 first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

Different lights make me strange by changing me into different sizes. What am I?

An explorer goes on an exposition in the jungle. He sets up camp in the middle of the jungle. The next morning he sees something with a head and a tail, but he is not afraid. What did he see in his bag?

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

which number am I?

Which of the eight images will fill the missing image in the puzzle below?

Can you find the dog hidden in a group of pandas?

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

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?