reasoning Maths Puzzle

I want to weigh 10 people. What is the minimum number of times I must use the scale?

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reasoning Other Question

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?
A woman was being robbed and she could only run away with two of her golden balls they each were 10 pounds an she was 100 pounds in order to get away she had to cross a bridge and the bridge had a completely accurate sighn that said ony 110 pounds was aloud to cross. if all together they were 120 pounds how did she get across?