Complete the following series. It.s very logical:

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

What goes through cities and fields, but never moves?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

My location can be determined by the below rebus.
So where am i ?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Find out the number of circles in the given picture having Illusion

The king of Octopuses has servants who have six, seven or eight legs. The distinguishing characteristics of the servants is that the one with seven legs always lie but the one with either six or eight legs speak the truth always.

One day, four servants meet and converse:

The black one says, 'We have 28 legs altogether.'

The green one says, 'We have 27 legs altogether.'

The yellow one says, 'We have 26 legs altogether.'

The red one says, 'We have 25 legs altogether.'


Can you identify the colour of the servant who is speaking the truth?

What do you call a fish without an eye?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?