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BTGmoderatorLU
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Source: Economist GMAT
A whale goes on a feeding frenzy that lasts for 9 hours. For the first hour, he catches and eats x kilos of plankton. In every hour after the first, it consumes 3 kilos of plankton more than it consumed in the previous hour. If by the end of the frenzy the whale will have consumed a whopping accumulated total of 450 kilos of plankton, how many kilos did he consume on the sixth hour?
A. 38
B. 47
C. 50
D. 53
E. 62
The OA is D
A whale goes on a feeding frenzy that lasts for 9 hours. For the first hour, he catches and eats x kilos of plankton. In every hour after the first, it consumes 3 kilos of plankton more than it consumed in the previous hour. If by the end of the frenzy the whale will have consumed a whopping accumulated total of 450 kilos of plankton, how many kilos did he consume on the sixth hour?
A. 38
B. 47
C. 50
D. 53
E. 62
The OA is D
