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

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

You need to move three matchsticks to form three squares. Can you do it?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

Can you guess the name of the month by looking the below rebus ?