A group of workers was put on a job. From the second day onwards, one worker was withdrawn each day. The job was finished when the last worker was withdrawn. Had no worker been withdrawn at any stage, the group would have finished the job in 55% of the time. How many workers were there in the group?	Choose the correct choice from the following answers:	A) 33	B) 38	C) 23	D) 10	E) 27
Explanation:   It can be solved easily through option.   \inline \left ( 10+9+8+....+1 \right )=10\left ( 10\times \frac{55}{100} \right )   55 = 55 Hence correct   Alternatively:   \inline \frac{n(n+1)}{2}=n\times \frac{55n}{100}   =&gt; n= 10   In Both cases total work is 55man-days.   Answer: 10) 10
<result>D</result>
A group of workers was put on a job. From the second day onwards, one worker was withdrawn each day. The job was finished when the last worker was withdrawn. Had no worker been withdrawn at any stage, the group would have finished the job in 55% of the time. How many workers were there in the group?