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.
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