# The volume of the barrel is 540 liters. 85% of this barrel is filled with water. How many liters of water is in this barrel?

July 31, 2021 | education

| To solve this problem, we use the proportion method.

Let’s take the volume of the barrel, 540 liters, for 100%. The barrel is 85% filled with water. Let 85% of the water in the barrel be X l.

Let’s write down the correspondence.

540 l. corresponds to 100%,

X l. corresponds to 85%,

Let’s write down the proportion:

540 / X = 100/85.

To solve this proportion, we use the “cross” rule: “The product of the extreme terms of the proportion is equal to the product of the middle terms.” Let’s write down:

540 × 85 = X × 100

x = (540 × 85) / 100 = 45900/100 = 459 l.

Answer: in a barrel of 459 liters. water.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.