Gunpowder contains 75% nitre and 10% sulphur. Find the amount of the gunpowder which carries 9 kg nitre. What amount of gunpowder would contain 2.3 kg sulphur?

Explanation

To solve the problem, we will break it down into two parts:

1. Finding the amount of gunpowder that contains 9 kg of nitre.
2. Finding the amount of gunpowder that contains 2.3 kg of sulphur.

### Part 1: Finding the amount of gunpowder that contains 9 kg of nitre

**Step 1:** Understand the percentage of nitre in gunpowder.
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