Over a seven week period a company monitored the output of two of its factories, C and D. Each week the company calculated how many units were produced in each factory. The factory that produced the greatest number of units for four or more of the seven weeks was considered the more efficient factory. Which factory was deemed the more efficient?
1) Over the seven week period factory C produced twice as many units as factory D.
D can be efficient and C can produce twice as many units. C can be efficient and produced twice as many units as factory D. Not sufficient.
2) The factory that was more efficient was known by the fifth week.
It can be C or D. Not suffi.
E is my answer.
agree with aurobindo.
btw, it seems to be the format of the DS does not look like a 'usual' GMAT question....