A girl wants to find the height of a building. She is standing 393 feet away from the building. There is a tree 42 in front of her, which she knows is 15 feet tall. How tall is the building?

My result is= \frac{42x}{42 } = \frac{5265}{ 42}= 125.357 or 125

http://img28.imageshack.us/img28/946...rybuilding.jpg