I’m tall when I’m young, and I’m short when I’m old. What am I?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

What is the end of everything?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

I look at you, you look at me, I raise my right, you raise your left. What am I?

What's a single-digit number with no value?

What is the fastest way to double your money?

Identify the hidden meaning behind this picture?