20 workers can finish a work in 30 days. After how many days should 5 workers leave the job so the work is completed in 35 days?  Select:
A) 7
B) 6
C) 15
D) 4
E) 3
Work done by 15 workers in 35 days = 15*35= 
<gadget id="calculator">15*35</gadget>
<output>525</output>
525 men days.   Now, work remaining= 600–525=75 men days and we have 5 workers .   So 5 workers will work for   75/5= 
<gadget id="calculator">  75/5</gadget>
<output>15</output>
15 days.   ANSWER:15
<result>C</result>
20 workers can finish a work in 30 days. After how many days should 5 workers leave the job so the work is completed in 35 days?