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A machine that produces stroopwafels operates for four hours. During the first hour the machine works at a constant rate. During the next two hours, it works at double that rate, and during the last hour it works at double its previous rate. If the machine produces X stroopwafels during the three first hours, then during the four hours the machine produces how many stroopwafels?
A. \(\dfrac{4}{5}X\)
B. \(\dfrac{9}{5}X\)
C. \(2X\)
D. \(\dfrac{9}{4}X\)
E. \(\dfrac{7}{3}X\)
The OA is B
Source: Economist GMAT
A. \(\dfrac{4}{5}X\)
B. \(\dfrac{9}{5}X\)
C. \(2X\)
D. \(\dfrac{9}{4}X\)
E. \(\dfrac{7}{3}X\)
The OA is B
Source: Economist GMAT
