If it took eight men ten hours to build a wall, how long would it take four men to build it?

If a wheel has 54 spokes, how many spaces are there between the spokes?

You are trapped in a room with two doors. One leads to certain death and the other leads to freedom. You don't know which is which.
There are two robots guarding the doors. They will let you choose one door but upon doing so you must go through it.
You can, however, ask one robot one question. The problem is one robot always tells the truth, the other always lies and you don't know which is which.
What is the question you ask?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Below, you can see some coding:
January = 1017
February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
August = 186

Now deciphering the way it has been coded, can you find out how September will be coded?

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.

How can you take 2 from 5 and leave 4?

Find the number of squares in the below-given picture.

I have Rs.50 and I spend it in the way as below.

Can you find out the number that should replace the question mark with a valid reason?