Solution:

The killer is Alice.
The number in front of the month's name in the note actually points towards the position of a particular letter in every month.
Second of January = A
Third of July = L
Fourth of April = I
Second of October = C
Fourth of December = E.

Thus, the name is Alice.

Solution:

I am Ambulance

Solution:

I am chair

Solution:

Actually there were only three people who went on fishing - a son, a father and a grandfather. They can obviously be denoted as two fathers and two sons.

Solution:

The question was 'What is the time?'

Solution:

He was walking

Solution:

This is possible because nobody was married in the bus.

Solution:

66

Explanation:
The total number of containers required = 9.

5 containers for large jars = 5 * 6 = 30 jars
4 containers for small jars = 4 * 9 = 36 jars

30 + 36 = 66 jars.

Solution:

She had a 50p coin, a 25p coin and four 10p coins.

Solution:

I understand