A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

81 x 9 = 801. What must you do to make the this equation true?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

How can you make a TV, a bed, a dog, and a car liquid?

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?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

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?

How can you make number one disappear by adding something to it?

A woman shoots her husband.

Then she holds him under water for over 5 minutes.

Finally, she hangs him.

But 5 minutes later they both go out together and enjoy a wonderful dinner together.

How can this be?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.