Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

what does the below math rebus puzzle mean?

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?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

There are two dice with empty faces in front of you and a marker. You can mark any number on each of the faces of the two dice, but you have to display all 31 days of the month using the two of them.

Which numbers will you mark on which dice so that you can easily depict all the dates of the month?

An ape is trying to climb on a pole that is 60 feet high. Due to the slippery surface, the ape climbs 3 feet in a minute only to slip back 2 feet.

How much time do you think the monkey will take to reach the top of the pole?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Can you find the key in the picture below?

During which month do people sleep the least?

I have branches, but no fruit, trunk or leaves. What am I?