A can do a piece of work in 12 days and B can do a piece of work in 18 days how many days will the work be completed if both of them work together?	Choices: A) 15 B) 7.2 C) 7.7 D) 7.4 E) 8
A's 1 day work=1/12,7.2's 1 day work =1/18;   (A+7.2) 1 day work=1/12+1/18=5/36;   they can finish the work in=36/5= 
<gadget id="calculator">36/5</gadget>
<output>36/5 = around 7.2</output>
7.2   ANSWER:7.2
<result>B</result>
A can do a piece of work in 12 days and B can do a piece of work in 18 days how many days will the work be completed if both of them work together?