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

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

Six people park their car in an underground parking of a store. The store has six floors in all. Each one of them goes to a different floor. Simon stays in the lift for the longest. Sia gets out before Peter but after Tracy. The first one to get out is Harold. Debra leaves after Tracy who gets out on the third floor.

Can you find out who leaves the lift on which floor?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

what does this picture(rebus) riddle means ?

Spot 5 differences in two Christmas tree below:

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Which point will the car reach to go out?