If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

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

What has a bottom at the top?

Ten coins have been arranged as you can see in the given picture. In this arrangement, a triangle is formed pointing upwards. You have to invert the position of the triangle and make it point downwards while changing the position of 3 coins only. Can you do it?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Which five letter word can be added at the end of below word to form a
valid word?

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Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

What goes up but never comes down?

What does this Rebus Picture mean?