Duralumin contains ________ % of aluminium.

Explanation

**Step-by-Step Solution:**

1. **Understanding Duralumin**: Duralumin is an alloy, which means it is a mixture of metals. In this case, it primarily consists of Aluminium along with Copper, Magnesium, and Manganese.

2. **Composition of Duralumin**: To answer the question, we need to know the percentage of Aluminium in Duralumin.

3. **Percentage of Aluminium**: Duralumin contains approximately 95% Aluminium. This high percentage is what gives Duralumin its desirable properties.

4. **Application of Duralumin**: Due to its strength and lightweight characteristics, Duralumin is commonly used in the aerospace industry, particularly in aircraft construction.

5. **Final Answer**: Therefore, Duralumin contains **95%** of Aluminium.

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