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Bunuel
A team of workers was employed by a contractor who undertook to finish 360 pieces of an article in a certain number of days. Making four more pieces per day than was planned, they could complete the job a day ahead of schedule. How many days did they take?

(A) 8
(B) 9
(C) 10
(D) 12
(E) 13

Hi Bunuel, I feel the question is asking " how many days the work was completed after the rate of output was increased ". Hence, I went with B. Could you please point out the flaw in my approach?
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Bunuel
A team of workers was employed by a contractor who undertook to finish 360 pieces of an article in a certain number of days. Making four more pieces per day than was planned, they could complete the job a day ahead of schedule. How many days did they take?

(A) 8
(B) 9
(C) 10
(D) 12
(E) 13

Hi Bunuel, I feel the question is asking " how many days the work was completed after the rate of output was increased ". Hence, I went with B. Could you please point out the flaw in my approach?

Agree, the wording could have been better. Edited the question. Hope now it's better.
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This seems like an easy one to do trial and error with the answers:

A) 360/8 = 45 units per day
B) 360/9 = 40 units per day
C) 360/10 = 36 units per day
D) 360/12 = 30 units per day
E) 360/13 = 27ish or 28ish units per day

Notice the difference between B & C is 4 units per day, hence B must be the +4 unit rate and C must be the original rate, hence C is the answer. Good strategy for plugging answers is to start with C, so if you were lucky enough to start with C and go up this took very little math.
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