What has lots of eyes, but can’t see?

What can go through glass without breaking it?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

I look at you, you look at me, I raise my right, you raise your left. What am I?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

When can we add 2 to 11 and get 1 as the correct answer?

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?