What does this below rebus puzzle mean?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

I know a nine-letter word having only one vowel.
Do you ?

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

What can go up a chimney down, but can’t go down a chimney up?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?

What is the Surname of Barbie Doll?