The first 10 floors are 10*12=<<10*12=120>>120 feet

There are a remaining 20-10=<<20-10=10>>10 stories

They are each 12+3=<<12+3=15>>15 feet

So those stories are 15*10=<<15*10=150>>150 feet

So the total height is 120+150=<<120+150=270>>270 feet

# Answer

270
Question:
James builds a 20 story building.  The first 10 stories are each 12 feet tall each.  The remaining floors are each 3 feet taller.  How tall is the building?
Answer:
Let's think step by step.

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270
James builds a 20 story building.  The first 10 stories are each 12 feet tall each.  The remaining floors are each 3 feet taller.  How tall is the building?
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