Answer
18 L
Work Step by Step
Unit for the answer (L) is in numerator; unit being changed (ml) is in denominator so it will divide out. The unit fraction is $\frac{1 L}{1000 ml}$.
Multiply 18,000 ml times to the unit fraction
18,000 ml * $\frac{1 L}{1000 ml}$.
= 18 L