Take away the whole and some still remain. What is it?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

Next Number in the Series,

5, 16, 49, 104, ?

In a town, there are over 100 flats.
Flat-1 is named first flat.
Flat-2 is named second flat.
Flat-3 is named third flat.

A visitors 'Victor' decides to walk through all the flats, he finds all the flats except flat-62.
Victor later founds that the local of the town have given it another name.

What is the name of the Flat?

Cristina leaves home and then she makes exactly 3 left turns and returns home where she found 2 girls wearing the mask.

Who are these two masked girls?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.