A furniture manufacturer has two machines, but only one can be used at a time. Machine E is utilized during the first shift and Machine B during the second shift, while both work half of the third shift. If Machine E can do the job in 12 days working two shifts and Machine B can do the job in 15 days working two shifts, how many days will it take to do the job with the current work schedule?  Select the correct option:
A) 14
B) 13
C) 11
D) 9
E) 7
machine E finish the job in 2*12= 
<gadget id="calculator">2*12</gadget>
<output>24</output>
24 shifts   machine B finish the job in   2*15= 
<gadget id="calculator">  2*15</gadget>
<output>30</output>
30 shifts   Lets assume total work require 120 shifts   Therefore,   rate of E= 5 shifts/day   rate of B = 4 shifts/day   rate of (E+B) = 9 shifts/day   According to current schedule work complete in a day = 5+4+(9/2)= 
<gadget id="calculator">5+4+(9/2)</gadget>
<output>27/2 = around 13.5</output>
13.5 shifts/day   Therefore, Time required to finish 120 shifts= (120/13.5) = 8.88.. days ~ 9 days=9
<result>D</result>
A furniture manufacturer has two machines, but only one can be used at a time. Machine E is utilized during the first shift and Machine B during the second shift, while both work half of the third shift. If Machine E can do the job in 12 days working two shifts and Machine B can do the job in 15 days working two shifts, how many days will it take to do the job with the current work schedule?