In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

I taste better than I can smell. Who am I?

Find the next number in the sequence

5 12 24 36 ?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?

This is a picture puzzle. You have to guess the name of the movie that can be related to the picture.

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

who is silent in the parliament?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

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?