An alloy consists of 13 parts of copper, 7 parts of zinc and 5 parts of nickel. Find the percentage of copper in the alloy.

Answer

To find the percentage of copper in the alloy, we can follow these steps:

### Step 1: Identify the parts of each component in the alloy.
- Copper: 13 parts
- Zinc: 7 parts
- Nickel: 5 parts

### Step 2: Calculate the total parts of the alloy.
To find the total parts, we add the parts of copper, zinc, and nickel together:
\[ \text{Total parts} = \text{Copper parts} + \text{Zinc parts} + \text{Nickel parts} \]
\[ \text{Total parts} = 13 + 7 + 5 = 25 \]

### Step 3: Calculate the percentage of copper in the alloy.
The formula to find the percentage of a component in an alloy is:
\[ \text{Percentage of Copper} = \left( \frac{\text{Parts of Copper}}{\text{Total Parts}} \right) \times 100 \]
Substituting the values:
\[ \text{Percentage of Copper} = \left( \frac{13}{25} \right) \times 100 \]

### Step 4: Perform the calculation.
Now we calculate:
\[ \text{Percentage of Copper} = \left( \frac{13}{25} \right) \times 100 = 52 \]

### Final Answer:
The percentage of copper in the alloy is **52%**.

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