The city of Boston decided to reconstruct its major tunnels. It estimated the job would require 612 mini projects spread evenly over an 18 month plan of completion. Only 108 mini projects had been successfully completed after 9 months. At this time, the construction was behind schedule by how many projects?  Pick one.
A) 34 B) 96 C) 198 D) 204 E) 504
Project/month :   612/18= 
<gadget id="calculator">  612/18</gadget>
<output>34</output>
34   Project in 6 month to be completed= 34*9= 
<gadget id="calculator">34*9</gadget>
<output>306</output>
306   Lag :  306-108= 
<gadget id="calculator">  306-108</gadget>
<output>198</output>
198   198 is the answer
<result>C</result>
The city of Boston decided to reconstruct its major tunnels. It estimated the job would require 612 mini projects spread evenly over an 18 month plan of completion. Only 108 mini projects had been successfully completed after 9 months. At this time, the construction was behind schedule by how many projects?