I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

You along with your friend are standing in front of two houses. Each of those houses inhabits a family with two children.

Your friend tells you the below two facts:
1) On your left is a family that has a boy who likes accounts but the other child loves science.
2) On the right is a family with a seven-year-old boy and a newborn baby.

You ask him, "Does either of the family have a girl?"

To this, he replies, "I am not quite sure. But can you guess that? If you are right, I will give you $500."

Which family do you think is likely to have a girl?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

What has a bottom at the top?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Solve the counting riddle by identifying the number of triangles in the given picture.

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

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

Can you find the hidden animal in the picture below?

What is both possible and impossible at the same time?