Solve: \( w = 8 \)
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- Perimeter formula: \( 2(\text{length} + \text{width}) = 64 \)
- Substitute: \( 2(3w + w) = 64 \)
- Simplify: \( 2(4w) = 64 \) → \( 8w = 64 \)
- A science lab has 150 test tubes. If 40% are used for chemical A, 30% for chemical B, and the rest are clean, how many clean test tubes are there?
- Chemical A: \( 150 \times 0.4 = 60 \)
- Chemical B: \( 150 \times 0.3 = 45 \)
