A LEED project requires tracking the recycled content of materials. The project uses 1000 tons of concrete with 20% fly ash content and 500 tons of steel with 90% recycled content. What is the total weight of recycled content materials?
Correct Answer
A) 650 tons
Concrete recycled content: 1000 tons × 20% = 200 tons. Steel recycled content: 500 tons × 90% = 450 tons. Total recycled content: 200 + 450 = 650 tons.
Why This Is the Correct Answer
Option C is correct because it properly calculates the recycled content for each material separately and then sums them. For concrete: 1000 tons × 20% = 200 tons of recycled content (fly ash). For steel: 500 tons × 90% = 450 tons of recycled content. The total recycled content is 200 + 450 = 650 tons, which represents the actual weight of recycled materials used in the project.
Why the Other Options Are Wrong
Option C: 1350 tons
Option A only accounts for the recycled content in concrete (200 tons) but completely ignores the recycled content in steel (450 tons), resulting in an incomplete calculation.
Option D: 450 tons
Option B only accounts for the recycled content in steel (450 tons) but ignores the recycled content from the fly ash in concrete (200 tons), missing a significant portion of the total.
Memory Technique
Remember 'PTA' - Percentage × Total = Amount for each material, then Add all amounts together. Don't confuse total material weight with recycled content weight.
Reference Hint
LEED Reference Guide for Building Design and Construction, Materials and Resources section, or Florida Building Code Chapter on Sustainable Construction practices
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