12 welders work at a constant rate they complete an order in 3 days. If after the first day, 9 welders start to work on the other project, how many more days the remaining welders will need to complete the rest of the order?  Choose the correct choice:	A) 5	B) 2	C) 8	D) 4	E) 6

Rationale: 1 . we need to find out the time taken by 3 workers after day 1 . 2 . total no . of wokers * total time taken = time taken by 1 worker 3 . time taken by 1 worker = 12 * 3 = 36 days 4 . but on day 1 twelve workers had already worked finishing 1 / 3 of the job . so 3 workers have to finish only 2 / 3 of the job . 5 . total time taken by 3 workers can be got from formula used at ( 2 ) . i . e . , 3 * total time taken = 36 . total time taken by 3 workers to finish the complete job is 36 / 3 = 12 days . 6 . time taken by 6 workers to finish 2 / 3 of the job is 2 / 3 * 12 = 8 days . the answer is choice c
Answer: C