Which tank will fill first?

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

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

Before Mount Everest was discovered, what was the highest mountain in the world?

Can you find out the remainder when 3^300 is divided by 5?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

What is the largest number you can write with just 3 digits?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?