A certain number of persons can finish a piece of work in 100 days. If there were 10 persons less, it would take 10 more days finish the work. How many persons were there originally?	Choose the correct choice from the following choices:
A) 90
B) 100
C) 110
D) 120
E) 130
Explanation:   Assume that x persons can finish a piece of work in 100 days   Also it is given that (x−10) persons can finish a piece of work in 110 days (∵ 100 + 10 = 110)   More persons, less days(indirect proportion)   Hence we can write as(persons) x : (x−10) :: 110 : 100   ⇒100x=110(x−10)   ⇒100x=110x−1100   ⇒10x=1100   ⇒x=1100/10= 
<gadget id="calculator">1100/10</gadget>
<output>110</output>
110   Answer: Option 110
<result>C</result>
A certain number of persons can finish a piece of work in 100 days. If there were 10 persons less, it would take 10 more days finish the work. How many persons were there originally?