I have an eye but still cannot see.

Who am I?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

What does this mean?

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I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?