Twenty litres of acid are included in an 80-liter combination of acid and water. How much water makes up the mixture?

Correct option is B

Given:

- Total mixture = 80 liters
- Acid = 20 liters

Formula Used:

- Percentage of Water = $$\frac{\text{Volume of Water}}{\text{Total Volume}} \times 100$$​
- Volume of Water = $$\text{Total Mixture} - \text{Volume of Acid}$$​

Solution:

1. Calculate the volume of water:
Volume of Water = 80 - 20 = 60 liters
2. Calculate the percentage of water in the mixture:
$$\text{Percentage of Water} = \frac{60}{80} \times 100 = 75\%$$​

Final Answer:

The percentage of water in the mixture is **(B) 75%**.