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?

Jenifer is learning to drive her car. She went down a one way lane and in the wrong direction. But she do not break any law.

How come ?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

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?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

You need to arrange three 7 and mathematical symbols to form number 1?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

There are forty elephants and they have forty-fore heads. How can this be possible?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?