How many sides does a circle have?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Sally lives in a place where six months of the year is mild summer and the temperature drops significantly the other six months. She owns a lake where there is a small island. She wants to build a house on the island and needs to get materials there. She doesn’t have a boat, plane, or anything to transport them to the island. How does Sally solve this problem?