Bronze is 80% copper and 20% tin. What mass of metals should be taken to obtain 2.5 tons of bronze?

Given: m (alloy) = 2.5 t, ω (copper) = 80%, ω (tin) = 20%,
Find: m (copper) – ?, m (tin) -?
Decision.
1. Calculate the mass of copper in the alloy:
m (copper) = (ω (copper) • m (alloy)): 100% = (80% • 2.5 t): 100% = 2 t.
2. Calculate the mass of tin in the alloy:
m (tin) = (ω (tin) • m (alloy)): 100% = (20% • 2.5 t): 100% = 0.5 t.
Answer: 2 tons of copper and 0.5 tons of tin.