easy · GMAT Quant

A recycling plant processes scrap metal mass m in tons by multiplying the original weight by 3 and then subtracting 18 tons of non-recyclable slag.

If the refined metal output is 162 tons, what was the original mass m in tons?

  1. 48
  2. 60
  3. 180
  4. 540
  5. 468

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