A group of men decided to do a work in 17 days, but 8 of them became absent. If the rest of the group did the work in 21days, Find the original number of men?	Choose the correct choice from the following options:
A) 15 B) 20 C) 42 D) 25 E) 18
Original number of men = 8*21 / (21-17)= 
<gadget id="calculator">8*21 / (21-17)</gadget>
<output>42</output>
42   Answer is 42
<result>C</result>
A group of men decided to do a work in 17 days, but 8 of them became absent. If the rest of the group did the work in 21days, Find the original number of men?