What has 13 hearts but no other organs?

How many letters are in the alphabet?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

How many triangles can you count in the figure given?

It belongs to you, but other people use it more than you do. What is it?

My location can be determined by the below rebus.
So where am i ?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?