Move four matchsticks to the below square to form three squares?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Can you count the number of blocks in the picture below?

How many letters are in the alphabet?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

An office is divided into 8 cubicles. How many of the cubicles are painted if only 1/8 of the cubicles are painted?

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?