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We are given that 20% of a number is 50, and we need to find the value of 40% of that same number.

Let's denote the unknown number as \( x \).

### Step 1: Set up the equation
We know:
\[
20\% \text{ of } x = 50
\]
This can be written as:
\[
0.2x = 50
\]

### Step 2: Solve for \( x \)
To find \( x \), divide both sides of the equation by 0.2:
\[
x = \frac{50}{0.2} = 250
\]

### Step 3: Find 40% of \( x \)
Now, we need to find 40% of \( x \). This is:
\[
40\% \text{ of } 250 = 0.4 \times 250 = 100
\]

Thus, the value of 40% of the number is **100**.

Let me know if you'd like more details or have any questions!

Here are 5 related questions:
1. What is 30% of the same number?
2. If 10% of a number is 25, what is the number?
3. How do you find the percentage of a number?
4. What is the relation between percentages and fractions?
5. Can you convert 50% into a decimal and a fraction?

**Tip:** When working with percentages, always express them as decimals to simplify calculations.

20% of a number is 50. What is the value of 40% of that number?

This guide explains how to calculate 40% of a number when 20% is given. It provides a step-by-step solution using basic percentage and algebraic concepts. Suitable for students in Grades 6-8.

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