A LEED project requires the use of materials with recycled content. The project uses 1000 tons of structural steel containing 25% recycled content and 500 tons of concrete with 15% fly ash content. What is the total weight of recycled/sustainable materials?
Correct Answer
D) 325 tons
Steel recycled content: 1000 tons × 25% = 250 tons. Concrete fly ash content: 500 tons × 15% = 75 tons. Total recycled/sustainable materials: 250 + 75 = 325 tons.
Why This Is the Correct Answer
Option C is correct because it properly calculates the recycled content from both materials and adds them together. The structural steel contributes 250 tons of recycled content (1000 × 0.25), and the concrete contributes 75 tons of fly ash content (500 × 0.15). The total sustainable/recycled material weight is 250 + 75 = 325 tons.
Why the Other Options Are Wrong
Option A: 375 tons
This answer appears to add incorrect percentages or double-count some materials, resulting in an inflated total that exceeds the correct calculation.
Option B: 250 tons
This answer only includes the recycled content from structural steel (250 tons) but fails to add the fly ash content from the concrete.
Memory Technique
Remember 'PART + PART = WHOLE' - calculate the recycled PART of each material type, then add all PARTS together for the WHOLE recycled content total.
Reference Hint
LEED Reference Guide for Building Design and Construction, Materials and Resources section, or Florida Building Code Chapter 11 - Energy Efficiency
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