Out of 50 children in a class, 20 are boys. Then the percentage of girls is

Options

A. 60
B. 30
C. 50
D. `66""2/3`

Answer

To find the percentage of girls in the class, we can follow these steps:

### Step 1: Determine the number of girls in the class.
- We know the total number of children in the class is 50.
- The number of boys in the class is 20.
- To find the number of girls, we subtract the number of boys from the total number of children.

\[ \text{Number of girls} = \text{Total children} - \text{Number of boys} = 50 - 20 = 30 \]

### Step 2: Calculate the percentage of girls.
- The formula to calculate the percentage is:

\[ \text{Percentage} = \left( \frac{\text{Number of girls}}{\text{Total children}} \right) \times 100 \]

- Plugging in the numbers we have:

\[ \text{Percentage of girls} = \left( \frac{30}{50} \right) \times 100 \]

### Step 3: Simplify the fraction.
- We can simplify \( \frac{30}{50} \):

\[ \frac{30}{50} = \frac{3}{5} \]

### Step 4: Multiply by 100 to find the percentage.
- Now we multiply by 100:

\[ \text{Percentage of girls} = \left( \frac{3}{5} \right) \times 100 = 60 \]

### Conclusion:
- The percentage of girls in the class is **60%**.

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