I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Which tank will fill first?

10+10 and 11+11 can give you the same answer.

Explain how?

How many times can you subtract the number 5 from 25?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

Different lights make me strange by changing me into different sizes. What am I?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

What do you see in the given picture?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?