Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

Take one out and scratch my head, I am now black but once was red. What am I?

How many triangles are there on the puzzle below?

Who can jump higher than a Mountain?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Can you solve below mathematical equation?

2^1234 - 2^1233

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Count the number of squares in the picture below.