hard · GMAT Quant
A pharmaceutical mixing concentration c is processed through three automated refining stages. Stage 1 calculates p = 3c - 4. Stage 2 calculates q = dfracp + 104. Stage 3 calculates r = q^2 - 31.
If the final concentration r = 50, and the concentration q after Stage 2 was strictly positive, what was the initial concentration c?
- 6
- 9
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- 15
- 26
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