X men can do a work in 120 days. If there were 20 men less, the work would have taken 60 days more. What is the value of X? Answers:  A) 30  B) 70  C) 80  D) 60  E) 20
60   60   We have M1 601 = M2 602   120X = (X - 20)180   =&gt; 2X = (X - 20) 3 =&gt; 2X = 3X - 60   =&gt; X = 60
<result>D</result>
X men can do a work in 120 days. If there were 20 men less, the work would have taken 60 days more. What is the value of X?