Remove two matchsticks to make the below equation correct.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

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?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

What can you hold in your right hand, but never in your left hand?

What is the next number?

77, 49, 36, 18 ?

Take away the whole and some still remain. What is it?

In the image below, can you find the value of an angle(y)

What came first, the chicken or the egg?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?