What goes through cities and fields, but never moves?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside. The man said, "Oh! I am really sorry, I thought this was my room." He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man. What made her suspicious of that man? He might have been genuinely mistaken.

Move three sticks of the spiral below to form a square.

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Count the number of balls in picture below:

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744

What can go through glass without breaking it?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?