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

I have Rs.50 and I spend it in the way as below.

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

Can you make four (4) nines (9) equal 100?

Find the value of "?" in the ball picture Riddle below:

What can you deduce from the following BrainBat?

CRY
LMKI

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

Find the last number in the series below:

voN luJ yaM raM ---