#### 2.6
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- Total moles: P₁V₁ + P₂V₂ = (2×10) + (3×15) = 20 + 45 = 65.
- Total volume: 10 + 15 = 25 L.
- Final pressure: 65 atm·L / 25 L = 2.6 atm.
- A software developer's app has 10,000 downloads. 20% rate 5 stars, 10% rate 1 star, and the rest rate 3 stars. What is the average rating?
- stars: 0.2 × 10,000 = 2,000 → 2,000 × 5 = 10,000.
- star: 0.1 × 10,000 = 1,000 → 1,000 × 1 = 1,000.
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