8 * 4 = <<8*4=32>>32 square feet

20 * 32 = <<20*32=640>>640 square feet

5040 - 640 = <<5040-640=4400>>4400 square feet

There are 42 - 20 = <<42-20=22>>22 remaining units

4400/22 = <<4400/22=200>>200 square feet

One of the remaining units is 200 square feet.

# Answer

200
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
The building has 42 storage units that are a total of 5040 square feet. Twenty of the units are 8 by 4 feet each. If the remaining units are all the same size, what is the area, in square feet, for one of the remaining units?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
200
The building has 42 storage units that are a total of 5040 square feet. Twenty of the units are 8 by 4 feet each. If the remaining units are all the same size, what is the area, in square feet, for one of the remaining units?
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