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?
["How Many Clean Test Tubes Are Left in the Science Lab?", "In a bustling science lab stocked with essential tools for research and education, understanding how resources are allocated is crucial—especially when managing hundreds of test tubes. Recently, a science lab reported that it contains 150 test tubes in total. To optimize workflow and safety, these test tubes are categorized by chemical usage: 40% for Chemical A, 30% for Chemical B, and the remainder remain clean and available for future experiments.", "How many clean test tubes are left after assigning some for chemical analysis? Let’s break it down step by step.", "### Step 1: Calculate the number of test tubes used for Chemical A\n40% of 150 test tubes are assigned to Chemical A:\n[ 0.40 \ imes 150 = 60 \ ext{ test tubes} ]", "### Step 2: Calculate the number used for Chemical B\n30% of 150 test tubes are reserved for Chemical B:\n[ 0.30 \ imes 150 = 45 \ ext{ test tubes} ]", "### Step 3: Determine the percentage and number of clean test tubes\nTotal used = Chemical A (40%) + Chemical B (30%) = 70%\nTherefore, the clean test tubes make up the remaining:\n[ 100% - 70% = 30% ]", "Now calculate 30% of 150:\n[ 0.30 \ imes 150 = 45 \ ext{ test tubes} ]", "### Conclusion\nThe lab has 45 clean test tubes available for new experiments, ensuring readiness without unnecessary reuse. Proper tracking of test tube usage enhances lab efficiency and safety—critical for both students and professionals.", "Task summary:\n- 40% → 60 tubes for Chemical A\n- 30% → 45 tubes for Chemical B\n- Remaining → 45 clean tubes\n- Ideal clean stock: 45 test tubes for future use", "Optimizing lab inventory like this ensures seamless operations and supports safe, effective scientific discovery.", "---", "Keywords: science lab test tubes, clean test tubes, chemical lab inventory, lab resource management, test tube usage calculation, 150 test tubes usage breakdown.\nMeta Description: Discover how many clean test tubes remain in a lab with 150 total tubes—where 40% and 30% are used for Chemical A and B, leaving 45 unused for future experiments. Perfect for lab efficiency and safety planning."]
