18 carat gold contains percentage of gold

Options

A. 90
B. 75
C. 50
D. 25

Explanation

To determine the percentage of gold in 18 carat gold, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Carat System**:
- The carat system is used to measure the purity of gold. Pure gold is defined as 24 carats (24K), which means it contains 100% gold.

2. **Identify the Carat Value**:
- In this case, we are dealing with 18 carat gold (18K).

3. **Set Up the Proportion**:
- We can set up a proportion to find the percentage of gold in 18 carat gold. The formula can be expressed as:
\[ \text{Percentage of Gold} = \left( \frac{\text{Carat Value}}{24} \right) \times 100 \]

4. **Substitute the Values**:
- Substitute the carat value into the formula:
\[ \text{Percentage of Gold} = \left( \frac{18}{24} \right) \times 100 \]

5. **Calculate the Percentage**:
- First, calculate \( \frac{18}{24} \):
\[ \frac{18}{24} = 0.75 \]
- Now multiply by 100 to find the percentage:
\[ 0.75 \times 100 = 75\% \]

6. **Conclusion**:
- Therefore, 18 carat gold contains **75% gold**.