if 12 men or 20 women can do a piece of work in 54 days, then in how many days can 9 men and 12 women together do the work?  Choose the correct choice from the following answers:
A) 10 days B) 30 days C) 20 days D) 80 days E) 40 days
<gadget id="calculator">12 * 54</gadget>
<output>648</output>

<gadget id="calculator">9 / 648</gadget>
<output>1/72 = around 0.013889</output>

<gadget id="calculator">20 * 54</gadget>
<output>1_080</output>

<gadget id="calculator">12 / 1_080</gadget>
<output>1/90 = around 0.011111</output>

<gadget id="calculator">(1/72) + (1/90)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">1 / (1/40)</gadget>
<output>40</output>

<result>E</result>
if 12 men or 20 women can do a piece of work in 54 days, then in how many days can 9 men and 12 women together do the work?
inverse(add(divide(9, multiply(12, 54)), divide(12, multiply(20, 54))))
"e 40 days given that 12 m = 20 w = > 3 m = 5 w 9 men + 12 women = 15 women + 12 women = 27 women 20 women can do the work in 54 days . so , 27 women can do it in ( 20 * 54 ) / 27 = 40 days ."