What is the missing number in these equivalent fractions? \[ \frac{2}{5}=\frac{?}{20} \]

To find the missing number in the equivalent fractions: \[ \frac{2}{5} = \frac{?}{20} \] Follow these steps: 1. **Set Up the Proportion:** Let the missing number be \( x \). Then you can write the equation as: \[ \frac{2}{5} = \frac{x}{20} \] 2. **Solve for \( x \):** To find \( x \), you can cross-multiply: \[ 2 \times 20 = 5 \times x \] \[ 40 = 5x \] 3. **Isolate \( x \):** Divide both sides of the equation by 5: \[ \frac{40}{5} = x \] \[ 8 = x \] 4. **Conclusion:** The missing number is **8**. Therefore, the equivalent fractions are: \[ \frac{2}{5} = \frac{8}{20} \]