The band earns $80 per gig because 4 x 20 = <<4*20=80>>80

They played 5 gigs because 400 / 80 = <<400/80=5>>5

# Answer

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<|im_start|>system
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<|im_start|>user
A band's members each earn $20 per gig. If there are 4 members and they've earned $400, how many gigs have they played?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
A band's members each earn $20 per gig. If there are 4 members and they've earned $400, how many gigs have they played?
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