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

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

What does the below image rebus riddle means ?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

How many triangles can you find in this given picture?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Solve the following series:
AZ, GT, MN, __, YB

What does this rebus mean?

O
N
C
E
TIME