hard · GMAT Quant
A chemical batch processor adds solvent S in discrete steps n = 1, 2, 3, dots. Step n adds 4n + 2 liters of solvent. However, when total accumulated solvent reaches or exceeds 100 liters, a concentration safety constraint alters the formula so that each subsequent step adds 2n - 5 liters instead.
What is the total volume of solvent added, in liters, across the first 8 steps?
- 118
- 126
- 137
- 142
- 160
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