I wash, cut and shave a dozen times a day yet I still have lots of hair. Who am I?
A barber!
How many times can you subtract the number 5 from 25?
Once, because after you subtract it's not 25 anymore.
I can laugh, I can cry, I can be the flying hero in the sky, I can be the devil, I can be a saint, I can do just about anything that you want me to be and I still get paid. Who am I?
An Actress/Actor
I am a mother but I have no son, no daughter nor a husband. Who am I?
Mother Earth!
Sometimes you are so relieved to see me, and other times you run from me in fear. Sometimes I stop you and sometimes I let you go, but whenever you need me I am always a quick call away. Who am I?
A police officer!
I purposefully give you problems yet I can also help you solve your problems, I give you instructions and guide yet I criticize you and point out your mistakes as well. I may know numbers, I may know how to sing or dance, and anything in between. Who am I?
A teacher!