A project can be completed in 16 days by the cooperation of A and B, 12 days by the cooperation of B and C, and 24 days by the cooperation of C and D. So how many days can A and D cooperate to complete?
一件工程，甲、乙两人合作16天可以完成，乙、丙两人合作12天可以完成，丙、丁两人合作24天可以完成．那么甲、丁两人合作多少天可以完成？
<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">1 / 24</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/24) - (1/12)</gadget>
<output>-1/24 = around -0.041667</output>

<gadget id="calculator">(1/16) + (-1/24)</gadget>
<output>1/48 = around 0.020833</output>

<gadget id="calculator">1 / (1/48)</gadget>
<output>48</output>

<result>48</result>