book Maths Puzzle Numerical Ability

A flag pole 20 feet high casts a shadow of 5 feet. At the same time, a nearby building casts a 20-foot shadow. How many feet high is the building? ( the ground is level and both the building and the flagpole are perpendicular to the ground)

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book Other Question
No matter how I try, I am not understanding this type of problem....
3x -2y + 5z
____________
2y -3x -5z

This is how I try....
3x (3x-2y + 5z) -(2y + 5z)
_________ Use transformations of the graph of y=x^4 and y=x^5 to graph:
a) f(x)=(x+2)^4 - 3.
b) f(x)=-(x+1)^5+2.