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?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

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?

Before Mount Everest was discovered, what was the highest mountain in the world?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

What breaks yet never falls, and what falls yet never breaks?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Can you solve this picture maths equation?

Do You See It?

What has to be broken before you can use it?