A can finish a work in 72days, B in 9days and C in 2days, B and C start the work but are forced to leave after 3 days. The remaining work was done by A in?	Answers:
A) 30days  B) 12days  C) 6days  D) 7days  E) 8days
B+C 1day work = 1/9 + 1/12 +  1= 
<gadget id="calculator">+  1</gadget>
<output>1</output>
1/9 + 1/12= 7/36   work done by B and C in 3days = 7/36 * 3 = 7/12   Remaining work = 1 - 7/12 = 5/12   1/24 work is done by 30days in 1day   5/12 work is done by 30days in   72*5/12= 
<gadget id="calculator">  72*5/12</gadget>
<output>30</output>
30days   30daysnswer is 30days
<result>A</result>
A can finish a work in 72days, B in 9days and C in 2days, B and C start the work but are forced to leave after 3 days. The remaining work was done by A in?