What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

I am an odd number. Take away a letter and I become even. What number am I?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

Can you decipher the two rows to find the hidden word?

Which alphabet letter is a question?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?