<human>:  A store owner repacked his oils into 200 mL bottles. He was able to make 20 bottles. How many liters of oil did the store owner have?
<bot>: How many mL are in 20 bottles of oil? ** Twenty bottles of oil is equal to 200 mL x 20 = <<20*200=4000>>4000 mL.
How many liters of oil did the store owner have? ** Since 1 liter is equal to 1000 mL, then the store owner had 4000/1000 = <<4000/1000=4>>4 liters of oil.
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