Final answer:
To find the number of cups that can be filled from 4 bottles of water, we can multiply the number of bottles by the number of liters per bottle and then multiply by the number of cups per liter.
Step-by-step explanation:
In this problem, we are given that each bottle of water contains 3 liters and each cup can hold 2/5 of a liter. We need to find how many cups can be filled from 4 bottles of water.
To find the number of cups, we can convert the liters to cups. Since 1 liter is equivalent to 2.5 cups (according to the table given), we can multiply the number of bottles by the number of liters per bottle, and then multiply by the number of cups per liter:
Number of cups = 4 bottles x 3 liters/bottle x 2.5 cups/liter = 30 cups.
Therefore, the correct answer is b. 30.