What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

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?

Find the missing letter in the last circle logically in the given below picture.

What does below rebus means ?

Can you make a six-letter word using the letters N, A and B ?

Can you identify the Oscar-winning movie from the rebus below?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

A crime was committed at baker street. Ibrahim Dakota who was shot in the stomach was the main suspect. Sherlock questioned the suspect. The conversation started as:
Sherlock: What's your story, Ibrahim?
Ibrahim: I was walking around baker street and suddenly a man from the back shot me. I ran as fast as I could to save my life".
Sherlock: That is enough (and ask the police to arrest him).

Why does Sherlock think he is the murderer?

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