Using Only Five 5's and any mathematical operator make sum as 37

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

Why Aeroplane windows are round?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

At a bar, three friends, Mr Green, Mr Red and Mr Blue, were having a drink. One man was wearing a red suit; one a green suit; and the other a blue suit. 'Have you noticed,' said the man in the blue suit, 'that although our suits have colours corresponding to our names, not one of us is wearing a suit that matches our own names?' Mr Red looked at the other two and said, 'You're absolutely correct. What colour suit is each man wearing?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.

Why is it against the law for a man living in Delhi to be buried in Mumbai?