What is harder to catch the faster you run?

Which digit occurred maximum times between the number 1 and 1000?

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

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?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

You need to move three matchsticks to form three squares. Can you do it?

What is black when you buy it, red when you use it, and gray when you throw it away?

What has a bottom at the top?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

What has many teeth, but cannot bite?