Bronze contains 85% copper, the rest is tin. How many kilograms more copper than tin is contained in 5 kg of bronze.

1. Since copper is 85%, we first find out the amount of tin.
100% – 85% = 15%.
2. Let’s make the proportion.
5kg – 100%, and x kg – 15%.
3. Hence: x = 5kg * 15%: 100% = 0.75kg. – we found how much tin is contained in 5kg of bronze.
4. Now we will find how much copper is contained in 5 kg of bronze.
5kg – 0.75kg = 4.25kg.
5. 4.25kg – 0.75kg = 3.5kg – that many kilograms more copper are contained in 5kg of bronze.