25 Is 20 Percent of What Number

25 Is 20 Percent of What Number: Understanding Percentages and Solving the Equation


Percentages are a fundamental concept in mathematics that we encounter in our daily lives. They allow us to express a fraction or a proportion of a whole number. One common question that often arises is, “What number is 25 when it represents 20 percent of it?” In this article, we will explore the concept of percentages, learn how to solve equations involving percentages, and answer frequently asked questions related to this topic.

Understanding Percentages:

Before diving into the equation, it’s crucial to understand what percentages represent. A percentage is a way of expressing a fraction of 100. For example, 20 percent is equal to 20/100, which can be simplified to 1/5 or 0.2 as a decimal. Similarly, 25 percent is equal to 25/100, or 1/4 as a simplified fraction, and 0.25 as a decimal.

Solving the Equation:

To determine what number 25 is when it represents 20 percent of it, we need to set up an equation. Let’s denote the unknown number as “x.” We can express the statement “25 is 20 percent of what number” as:

25 = 0.2x

To solve this equation, we can follow a simple algebraic process. First, we divide both sides of the equation by 0.2 to isolate the variable:

25 / 0.2 = x

Simplifying this equation, we find that:

125 = x

Therefore, the number that represents 25 when it represents 20 percent of it is 125.


1. What is a percentage?
A percentage is a way of expressing a fraction or a proportion of a whole number out of 100. It is denoted by the symbol “%.”

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2. How do I calculate percentages?
To calculate a percentage, divide the given number by 100 and then multiply it by the desired percent. For example, to find 20% of 50, divide 50 by 100 and multiply it by 20: (50/100) * 20 = 10.

3. Can percentages be greater than 100?
No, percentages cannot be greater than 100. Percentages represent a fraction out of 100, so any value greater than 100 would exceed the whole.

4. How do I find the percentage if I know the part and the whole?
To find the percentage, divide the part by the whole number and multiply the result by 100. For instance, if you have 25 as the part and 100 as the whole number, the percentage would be (25/100) * 100 = 25%.

5. What if the percentage is given and I need to find the part?
If the percentage is given and you need to find the part, multiply the percentage by the whole number and divide the result by 100. For example, if the percentage is 20 and the whole number is 80, the part would be (20 * 80) / 100 = 16.

6. Can percentages be negative?
Percentages are typically used to represent positive values. However, in some contexts, such as profit or loss calculations, percentages can be negative if the result indicates a decrease or loss in value.


Understanding percentages is essential in various aspects of life, including finance, statistics, and everyday calculations. When faced with the question, “What number is 25 when it represents 20 percent of it?”, we can solve the equation by isolating the variable and finding the value that satisfies the equation. Remember, percentages are merely fractions out of 100, allowing us to express proportions and compare quantities effectively. With this knowledge, you can confidently solve percentage-related problems and equations.

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