<human>:  Mr. Ray has 100 customers waiting at his fish market. He has 10 tuna, each of which weighs 200 pounds. Each customer wants 25 pounds of tuna. Mr. Ray's store is first come, first served. How many customers will go home without any fish?
<bot>: How many pounds of fish does Mr. Ray have? ** He has 2,000 pounds of fish because 10 x 200 = <<10*200=2000>>2,000
How many pounds of fish does Mr. Ray have for each customer? ** He has enough for 80 customers because 2,000 / 25 = <<2000/25=80>>80
How many customers go home without any fish? ** 20 customers go home without any fish because 100 - 80 = <<100-80=20>>20
#### 20