Final answer:
The ratio of a liter and 150 milliliters can be written as 20/3.
Step-by-step explanation:
The ratio of a liter and 150 milliliters is obtained by writing a ratio that compares the unit as it is given to the unknown converted unit:
a liter / 150 milliliters
The ratio can be rewritten as:
= 1 liter / 150 milliliters
= 1000 ml / 150 ml
= 100 / 15
= 20 / 3.