Irene R. answered 12/21/19
Tutor
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BS in Mechanical Engineering and Certified math teacher for 13 years
First determine how many liters he can make in a single day:
18/6 = 3 liters in 1 day
For 10 days, you would multiply this unit rate by 10:
3 liters * 10 = 30 liters in 10 days