Complete the following series. It.s very logical:

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

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

How can a man go eight days without sleep?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

Using Only Five 5's and any mathematical operator make sum as 37

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

I’m tall when I’m young, and I’m short when I’m old. What am I?

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?